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Qingdao Tianhua Yihe Foundry Factory
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Qingdao TianHua Yihe Foundry Factory located in the beautiful port city of Qingdao, we have 20 years experience in the production of metal fabrication products. We provide a custom metal fabrication solutions according to customer requirements, includes prototyping design, drawing converting, manufacturing,quality control, reports, printing,packaging,container loading and delivery solution. Our mainly service of metal fabrication includes sheet metal and tube fabrication, includes metal cutting ...
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5 steps for proper weld preparation
In any application, properly preparing metal for welding is key to producing high- quality results, maintaining consistent productivity levels, and minimizing costs—especially costs related to rework and downtime. Starting with the cleanest possible surface greatly increases the chances for a sound and strong weld. That’s why arming operators with the best practices for completing weld prep correctly and efficiently is important to streamlining the overall welding operation. 1. Form a Plan For proper weld preparation, it’s important to have a plan before getting started. Otherwise, it’s easy to jump fully into a project that seems simple and then quickly discover there are many factors that can lead to costly delays, additional steps, or rework. Having a plan also helps you resist the urge to take shortcuts when issues arise. Consider these questions when putting together your weld prep strategy: .What is required for the welding process I am using? If you’re shielded metal arc welding (SMAW), you can often get away with some impurities on the material surface, but the process requires more postweld and interpass cleaning. Gas metal arc welding (GMAW) and gas tungsten arc welding (GTAW) typically require more preparation and a cleaner surface to produce quality welds, but also require less effort for postweld cleanup. • Which media is best for the material I am working with? Some materials, such as hot-rolled steel, have heavy mill scale on the surface that must be completely removed before welding. Harder materials like INCONEL alloys work-harden and require high-performance abrasives, like ceramic, for weld prep. Soft and nonferrous materials like aluminum may be more susceptible to wheel loading, sometimes referred to as clogging. This is where particles from the base material adhere to the wheel, and require an abrasive that is designed to prevent material from building up in the medium • What is the final finish requirement? It’s important to know and understand the finish requirements when choosing your abrasive.   2. Cut, Fit, Bevel   Once your plan is in place, the second step in preparing metal for welding is often cutting, fitting, and beveling the base material. The amount of care and preparation you put into the initial cut can reduce the amount of work that goes into cleaning later. Many tools can be used for cutting, including a torch/plasma cutter, shears, laser/waterjet/CNC tables, and manual tools such as cutting wheels. Each type has pros and cons.   Properly preparing metal for welding is key to producing high-quality results, maintaining consistent productivity levels, and minimizing costs. Making the initial cut as clean, straight, and consistent as possible will make it easier for you to produce quality results. Offhand cutting with a right-angle grinder is inexpensive, portable, and does not require as much setup and maintenance as most of the other options. However, to achieve clean, straight cuts, you need a fair amount of practice and skill. A clean, consistent gap between the two pieces to be welded will produce a stronger, more consistent weld with less filler metal, reducing costs and saving time.   3. Prep, Clean the Surface   Once the material is cut and beveled, it’s time to prepare the surface for the initial welding pass. Removing any mill scale, chemicals, contaminants, and coatings from the base material helps ensure proper weld penetration and eliminate impurities, porosity, and inclusions. Be sure to clean the work surface thoroughly within an inch of the joint on both sides. When cleaning some stainless steels and other alloys, you may be fine using acetone and a wire brush rather than an abrasive medium. Rust, rubber coatings, powder coat, and paint are light enough that they can be cleaned more effectively with a wire brush. If the application requires an abrasive product for surface cleaning, consider what you’re trying to remove. For weld preparation, start with a less coarse option and increase in aggression only as necessary. With heavier coatings and mill scale, the best option is usually a grinding wheel or a flap disc. Flap discs are commonly used in weld preparation because they are easy to control and you can grind, finish, and blend all at once. A grinding wheel is more aggressive and durable, which is helpful when working with jagged or uneven seams, like torch slag. Be careful not to get too heavy-handed with a grinding wheel, because it’s easy to remove too much base material.   4. Choose the Optimal Grit   A common misconception is that a coarse abrasive will always get the job done faster. While it’s true that coarser, more aggressive abrasive will remove material faster, that’s not always a good thing. Using an abrasive that is too coarse abrasive can remove excess material or damage the surface. Removing too much material may put the finished part outside final specifications and tolerance. Because the scratch pattern is coarser, it can also be more difficult to see surface imperfections and cracks during visual inspection. While you may not remove material as quickly with a finer abrasive, it’s often more productive, can minimize the number of passes needed to achieve the desired finish in less time, and can prevent rework.   The outside corner of a grinding wheel is the most aggressive, so the steeper the angle of approach, the greater the possibility the wheel will remove more surface material than desired and undercut or gouge the workpiece. A lower grinding angle helps you maximize control and reduce the risk of gouging. For the strongest, most consistent welds, you want consistent material and wall thickness. If you use an overly aggressive abrasive, it can gouge or undercut the surface. A hard grinding wheel will typically remove mill scale with minimal effort, but it also requires a higher level of skill to prevent removing too much material. Coarse-grit (24 and 36) flap discs and coated abrasives can also get the job done quickly, but they can load. This wastes valuable time and increases operator fatigue and frustration. You can improve results significantly by choosing an abrasive designed to clear material and minimize loading using a top coating as well as open-coat grain. Depending on the material and its condition, a 60-grit coated abrasive flap disc can provide all the aggression necessary and ultimately get the job done more quickly than a coarse-grit flap disc. The 60-grit disc leaves a better finish and is less likely to gouge and undercut, allowing you to get the desired finish faster with fewer passes, no heat discoloration, and less effort. Whenever you can reduce the number of secondary operations, you reduce operational cost significantly.   5. Select the Right Abrasive Profile   Several abrasive profiles are available that can make the job easier or harder. Wire wheels are much more resistant to loading but do not remove base material. That makes them a good choice for removing surface contaminants and coatings without affecting the base metal. Abrasives are designed to cut and remove base metal. Because of abrasives’ construction, heavy coatings and base material can build up between the grains and reduce their ability to cut. A type 27 (flat profile) flap disc can create a significantly different result than a type 29 (conical profile). The wrong profile actually limits the amount of abrasive contacting the surface metal. Choose a type 27 flap disc for lower grinding angles (5 to 10 degrees) and light pressure applications like finishing and blending. Choose a type 29 flap disc when grinding at higher angles (15 to 30 degrees), which is more typical for aggressive material removal. A wire brush also comes in various styles and sizes. Wire gauge and knot type are the most effective performers. Options include stringer bead, cable twist, and standard twist. • A stringer bead brush has knots that are twisted very tight into a narrow profile. This brush is designed for cleaning in tight gaps and initial weld passes in pipeline and multipass welds. They are commonly used in general fabrication applications as well. • A cable twist brush uses a knot that is twisted to the end, with more wire in the knot so it has additional width, stiffness, and aggression. It can be significantly more effective for weld prep if you don't specifically need to get into a narrow 1/8-in. gap. • A standard twist brush’s knot is not twisted all the way to the edge, allowing the tips to spread at the end to increase conformability. They are effective for components with a lot of surface imperfections, textures, or contours. Inexperienced operators often get the most efficient cleaning with a standard twist brush because it covers a wider footprint and is easier to control   Weld Prep Tips   Following some best practices can help you optimize results in your weld preparation, cleaning, and grinding jobs. • Lower the grinding angle: When you are using a grinding wheel, lower the grinding angle. That helps you maximize control and reduce the risk of gouging. The outside corner of a grinding wheel is the most aggressive, so the steeper the angle of approach, the greater the possibility the wheel will remove more surface material than you want and undercut or gouge the workpiece. By lowering the angle, you widen the wheel’s surface contact with the workpiece and reduce the wheel’s aggressiveness. • Watch the pressure. If you use wire wheels, remember that the tips of the wires are designed to do the work. Pressing too hard can cause the wires to bend so that the tips are no longer striking the material. • Use consistent strokes. Enter the grinding stroke on a pull rather than on a push to help control the aggression of the grinding wheel. Grind in line with the material using smooth, even strokes rather than short, choppy strokes. This provides effective results with coated abrasives and bonded abrasives. • Avoid arm grinding. When you use only your arms to operate a grinding wheel, the wheel vibration can take a toll on your wrists and forearms. Instead, use your legs and large muscles of your body to help move and control the grinder. To minimize fatigue, move your entire body in the direction of the movement rather than just your arms. Properly cleaning and preparing your base material is a critical first step in producing high-quality welds. Remember that when you’re preparing to weld, you want to remove impurities and coatings from the surface—you don’t want to remove excess surface material. Choosing the right product for welding preparation and following best practices can help you achieve the results you want.
TIG welding sheet metal: perfect to weld thin sheets
TIG welding sheet metal: perfect to weld thin sheets TIG welding is particularly suitable for welding thin sheet metal and can be used for both continuous and spot welding. Learn more about its features. TIG (Tungsten Inert Gas) welding sheet metal is certainly one of the most common welding methods. This is an arc welding process with an infusible (tungsten) electrode, protected by inert gas (the gases most commonly used are argon or helium), which can be performed with or without filler metal. TIG welding is particularly suitable for welding thin sheet metal and can be used for both continuous and spot welding. This specific welding technology was initially developed for the aviation industry during the Second World War, to replace rivets with welds on planes (much lighter with the same resistance). Since then, its uses in the industrial sector have multiplied dramatically. TIG welding sheet metal provides high quality joints and is therefore particularly suitable for welding thin sheets, unlike a traditional welding technique where the risk of piercing the metal is high. TIG (Tungsten Inert Gas) Welding is most commonly used to weld thin pieces of stainless steel and non-ferrous metals such as aluminum, magnesium, and copper alloys. Versatile welding process with superior results Complex process requires a high degree of skill Slower yet more precise welding process; produces a superior-looking weld Can produce tricky welds, such as round or S curves How TIG welding sheet metal works In TIG welding, material is supplied manually with the help of a bar or automatically with a spooled wire. This procedure is suitable for performing high quality welds in case of joining thin stainless steel thicknesses by melting the edges, with small additions of material (in some cases even without filler material). To TIG weld thin sheets, a torch is used in which the tungsten electrode is inserted, around which the protective inert gas flows on the melting bath. The operator moves the torch along the joint to move the melting bath, positioning the infusible tungsten electrode at a maximum distance of a few millimeters and keeping this distance stable. During the operation it is very important to prevent the electrode from coming into direct contact with the piece to be welded, since the tungsten rod would stick to the joint and stop welding. Thyhmetalfab: your point of reference for TIG welding thin sheet metal This sheet welding process is an excellent solution to obtain results without burrs, but it takes highly specialized operators, especially when it comes to handling thin sheets, to obtain state of the art TIG welding. At Minifaber we TIG weld sheet metal in-house, in a protected and controlled environment, thus optimizing times and costs for the creation of complex, finished or semi-finished products. Our machine flee includes an MIG-TIG anthropomorphic welding robot and 8 welding machines entirely specialized in TIG, through which we manufacture both semi-finished and finished products with high added value.  
6 Methods of Sheet Metal Welding
6 Methods of Sheet Metal Welding Now, let’s take a comprehensive look at some methods for melding metal sheets. 1. MIG Welding Metal Inert Gas welding (MIG), also known as Gas Metal Arc Welding. It involves feeding a continuous solid wire electrode into the weld puddle with a welding gun. The melted wire in the pool causes the joining of the metal pieces. The shielding gas in the welding gun prevents atmospheric contamination of the weld puddle. MIG welding creates top-quality welds, and it’s suitable for most sheet metals, such as aluminum, steel, and stainless steel. This welding method is the go-to technique in the automotive and home improvement industry. Also, it is a cost-effective technique, as it requires no sophisticated machines. TIG Welding Tungsten Inert Gas (TIG) is an arc welding that involves using a non-consumable tungsten electrode under DC or AC to produce its weld. Like MIG welding, it uses inert shielding gas – argon or helium to prevent atmospheric contaminants and oxidation of the electrode and puddle. TIG welding is suitable for welding non-ferrous metals like aluminum, titanium, copper, nickel, magnesium, chromium, etc. It is a valuable technique for the aviation and aerospace industries. Also, it is ideal for fabricating frames for motorcycles, doors, and feeders. This welding method provides the welder with better control leading to a neat and strong weld. However, it may be time-consuming and requires expertise on the part of the welder. Stick Welding Stick welding is referred to as shielded metal arc welding. It is a manual arc welding process that uses a stick covered in flux as an electrode. An electric current from the welding power supply forms an arc between the pieces joining metals and the electrode. It is suitable for tough metals like iron and steel. The process does not use any shielding gas. As heat is generated, it disintegrates the flux covering the electrode, forming a slag that protects the weld pool from contamination. This welding technique is perhaps the most convenient, as its equipment is compact and portable – easily carried around. It is a common technique in construction, shipbuilding, and steel fabrication industries. Plasma Arc Welding Plasma arc welding is similar to TIG welding in that it uses a tungsten electrode. However, it uses a small arc and permits placing the electrode on the welding torch body. The pressurized gas forms a hot plasma, which melts the metals together to create solid welds. This welding technique requires low power and works at high speed. Moreover, it produces precise welds making it widely accepted in the aviation and marine industries. Like TIG welding, plasma arc welding does not require filler materials. Also, it produces high-quality welds with less need for finishing. Electron Beam and Laser Welding As the name suggests, laser and electron beam welding uses lasers and electron beams as the heat source to fuse and join pieces of metals. Unlike most other methods, this welding technique requires a sophisticated machine or automated robots. It is a high-precision welding technique, which makes it suitable for operations with intricate details. The laser beams can focus on the tiniest of substances for extreme accuracy welding. Moreover, it is suitable for welding tough metals like carbon steel, titanium, stainless steel and aluminum. The technique is also suitable for thermoplastics. The method yields products of great aesthetic appeal, reducing post-production needs. Gas Welding Gas welding is one of the traditional forms of welding by heat. It involves using heat generated from burning fuel (gasoline), oxygen, or oxyacetylene to join pieces of metals together. The burning of these fuels produced very hot flames that melt metal surfaces during joining. The technique remains one of the most used welding methods in industries. It has a broad scope of application, suitable for both ferrous and non-ferrous metals. Also, it is effective and efficient for welding pipes and tubes, repairs of ventilation and air conditioning systems, etc. Unlike many other welding techniques, it doesn’t require electricity. Also, it is portable, highly economical, and doesn’t require the services of specialists.

2023

02/28

TianHua Yihe Metal Fabrication Finishing Services
Thyh Metal Fabrication Finishing Services: Deburring, Polishing and Painting Deburring and polishing are key finishing processes in metal fabrication, necessary before the final step of painting. Deburring Deburring removes burrs that may occur during metal fabrication. Although burrs are usually minor, they can cause assembly issues or damage the integrity of finished parts if not removed. The deburring process eliminates these potential hazards. Deburring includes a variety of manual and mechanical processes: Cutting: Drills, files, scrapers, brushes, bonded abrasive methods, mechanical edgers or machine deburring. Power brushing: Uses metal filament brushes in a variety of materials, shapes and sizes. Fast and cost-effective. Bonded abrasive finishing: A sanding method that uses belts, sheets, pads, disks or wheels. The most common abrasives are aluminum oxides, silicon carbide, or zirconia compounds. Abrasive blasting: Propelled by air pressure, abrasive blasting can be done wet or dry. Mass finishing allows multiple parts to be deburred and finished simultaneously. This may be the final step in the finishing process for functional parts. Methods include vibratory finishing, barrel tumbling, and centrifugal finishing. Electropolishing is a non-mechanical, non-distorting deburring method that is often used to remove burrs from complex or fragile parts. The appropriate deburring process depends on the size and shape of the burr, and what it will take to remove it without damaging the fabricated metal part. All Metals’ skilled fabricators can determine the best deburring and finishing processes to achieve precision parts.   Polishing This metal finishing process is one of the final steps of fabrication, after laser cutting, forming or bending, deburring and other metal fabrication processes. Polishing removes any remaining miniscule burrs, and then buffs it to a final finish. The end goal of metal polishing is a smooth surface that suits your project. Metal polishing utilizes an abrasive compound adhered to a wheel or belt that provides friction. The condition of the metal at the beginning of the polishing process is what determines the type of abrasive that we will be used to create the desired finish. We have both in house expertise and key vendor relationships to accomplish nearly any desired metal finish, from #3 graining to #8 mirror and everything in between. Thyh Metals Fabrication offers a full range of fabricating and finishing services, including laser cutting, bending, forming, deburring, polishing and painting. Being a one-stop shop means you can rely on quality processes from beginning to end of your metal fabrication project. Ready to discover how our precision processes can provide the finishing touches to your metal fabrication project? Request a quote here and one of our expert sales and estimating staff members will be happy to walk you through your next project.   Painting Choosing a paint finish is an essential step in the metal fabrication process. The right paint finish can prolong the lifespan of metal parts and improve appearance. We have both in house knowledge and key vendor relationships to accomplish painting as simple as primer coats and as extensive as Kynar and enamel paints. We are qualified to offer the best paint quality and protection for any type of metal or project. Applying paint to sheet metal is similar to applying paint to other surfaces. We begin with a clean metal surface to eliminate any debris or rust, then apply a rust-inhibiting primer on ferrous metals. The primer coat is followed by multiple layers of paint, and finish with a protective coating. We can paint ferrous and non-ferrous metals. Painting and top coat services include: Zinc-rich primer Water-based latex primers Epoxy Urethanes Military-compliant CARC finishes Our design team and engineers will work with you to decide which paint finish best suits your metal fabrication project and budget. Talk to a project manager to discover the best metal finishing application for your project.      

2022

12/13