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Workpiece preparation before flash butt welding
Wuxi Xinxing Welding Equipment Factory mainly produces: spot welding machines, butt welding machines, flash butt welding machines, medium frequency spot welding machines, energy storage spot welding machines, nut spot welding machines, polymer diffusion welding machines and other resistance welding equipment! QQ online consultationSitemapContact us
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Workpiece preparation before flash butt welding
Release time:2022.06.09
Summary of information:
Before using a newly purchased flash butt welding machine, you will generally feel a little at a loss. Xinxing Welding recommends that you please pay attention to some matters before welding, during welding and after welding according to the instructions.
Newly purchasedFlash butt welding machineBefore use, you will generally feel a little at a loss. Xinxing Welding recommends that you please pay attention to some matters before, during and after welding according to the instructions.
Workpiece preparation for flash butt welding includes: end face geometry, blank end processing and surface cleaning.
1. During flash butt welding, the geometry and size of the butt surfaces of the two workpieces should be basically the same at least in the electrode section. Otherwise, it will not be possible to ensure that the heating and plastic deformation of the two workpieces are consistent, which will affect the quality of the joint. In production, the difference in diameter of circular workpieces should not exceed 15%.Shape workpieces and tubular workpieces should not exceed 10%.
2. When flash butt welding large-section workpieces, it is best to chamfer the end of a workpiece to increase the current density to facilitate flashing. This eliminates the need for preheating or increasing the secondary voltage during the initial flash phase.
3. The butt welding blank end must be processed on a cutting machine, sawing machine, and hydraulic shear in advance, and then the end face must be cleaned.
During flash butt welding, the end metal is burned during flashing, so the requirements for end face cleaning are not very strict. However, the cleaning requirements for the contact surface between the clamp and the workpiece should be the same as for resistance butt welding.
Wuxi Xinxing Welding Equipment Factory has been engaged in resistance welding for 29 years. Its core technology products include: semi-automatic butt welding machine, pneumatic-flash butt welding machine, multi-strand wire welding machine, foot spot welding machine, pneumatic spot welding machine, medium frequency spot welding machine, row welding machine, mesh welding machine,Resistance automatic welding machine, energy storage welding machine, copper rod and aluminum rod disc circular welding machine, auto parts spot welding machine, sheet metal spot welding machine, home appliance hardware spot welding machine, small electrical appliance spot welding machine, copper row copper pipe welding machine, nut spot welding machine, stainless steel welding machine, foil strip spot welding machine, aluminum spot welding machine, multi-head spot welding machine, bag There are more than 300 types of cage spot welding machines, mesh welding machines, ton rack welding production lines, resistance automatic welding machines, brazing machines, diffusion welding machines, projection welding machines, seam welding machines, wire and cable optical cable supporting equipment, etc. If you are interested in our welding equipment, please contact us.
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Butt welding of medium carbon steel
Summary of information:
Butt welding of medium carbon steel includes spot welding, projection welding, seam welding and butt welding. The first three are vertical welding, and butt welding is horizontal butt welding. Commonly used in production are spot welding and butt welding, so let’s talk about spot welding first. Medium carbon steel contains more than 0.25% carbon and has certain hardenability, such as common 50 steel, 45 steel, medium carbon alloy
Butt welding of medium carbon steel includes spot welding, projection welding, seam welding and butt welding. The first three are vertical welding, and butt welding is horizontal butt welding. Commonly used in production are spot welding and butt welding, so let’s talk about spot welding first.
Medium carbon steel contains more than 0.25% carbon and has certain hardenability, such as common 50 steel, 45 steel, medium carbon alloy steel, etc. It has poor weldability, generates heat quickly during welding and dissipates heat quickly, easily generates a brittle and hard martensite structure, and has a large heat-affected zone, which reduces the strength and is prone to spattering. Thick plates are prone to cracks and looseness, so if this type of steel is spot welded with an AC spot welder, it needs to be annealed before welding. If a medium frequency spot welder is used, it can be directly welded because it has the function of tempering and welding at the same time.
Welding points:
1. Medium carbon steel of 0.1~4mm can be welded with low current parameters for a long time. The welding time is 3-4 times that of low carbon steel with the same thickness. At the same time, the electrode pressure needs to be reduced.
2. The surface of low carbon steel must be cleaned of oil stains, oxide layers, rust stains and other impurities before welding.
3. Use electrodes made of chromium-zirconium-copper material. It has moderate conductivity and strength, is not easy to soften when welding at high temperatures, and is durable and wear-resistant.
4. When choosing an AC spot welder, you should choose a single-pulse or three-pulse controller type pneumatic spot welder, so that you can accurately control the welding current, welding time and current rising slope.
5. In order to prevent the occurrence of cracks and looseness, it is advisable to increase the pneumatic pressure method of upsetting force in a precise period of time, and the force is 2~2.5 times of the electrode pressure.
Wuxi Xinxing Welding Equipment Factory has been engaged in resistance welding for 29 years. Its core technical products include: semi-automatic butt welding machine, pneumatic-flash butt welding machine, multi-strand wire welding machine, foot pedal spot welding machine, pneumatic spot welding machine, medium frequency spot welding machine, row welding machine mesh welding machine, resistance automatic welding machine, energy storage welding machine, copper rod and aluminum rod disc circular welding machine, auto parts spot welding machine, sheet metal spot welding machine, home appliance hardware spot welding machine, small electrical appliances There are more than 300 types of spot welding machines, copper bar copper tube welding machines, nut spot welding machines, stainless steel welding machines, foil strip spot welding machines, aluminum spot welding machines, multi-head spot welding machines, bag cage spot welding machines, mesh welding machines, ton rack welding production lines, automatic resistance welding machines, brazing machines, diffusion welding machines, projection welding machines, seam welding machines, wire and cable optical cable supporting equipment, etc. If you are interested in our welding equipment, please contact us.
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