What are the welding requirements for anti-static caster brackets

What are the welding requirements for anti-static caster brackets

Before welding the caster bracket, the welder must pass the test of the corresponding test piece according to the "Test Procedure". It is strictly forbidden to arbitrarily ignite the arc on the surface of the weldment, test the current or temporarily support the welding caster bracket. The argon arc torch and argon decompression flowmeter used by the welding machine should be checked frequently to ensure that the argon gas is laminar during the argon arc welding seal.

Before the interface, the oil on the groove surface and the inner and outer walls of the substrate should be cleaned until a metallic sheen emerges. The cleaning range on each side is 10-15mm, and the gap on both sides is 2.5-3.5mm. The interfacial gap should be straight and strong counterparts should be prohibited.

The wrong value should be less than 10% of the wall thickness and no more than 1mm. Trimming should be done when the local gap of the interface is too large. It is strictly forbidden to add plugs in the gap.

After the interface is qualified, it should be 4-5 points according to the length of the interface. Spot welding materials should be the same as for formal welding. The length of spot welding is 10-15mm, and the thickness is 3-4mm.

After the bottom is completed, the quality of the bottom welding seam should be carefully checked, and TIG welding cover caster bracket welding should be carried out after the qualification is confirmed. Arc and arcing must be done in the interface. The arc should be filled with a molten pool and the arc should be directed into the groove to extinguish the arc.

Spot welding, TIG welding and cover welding. If a defect occurs, it must be removed with an electric grinder before continuing to weld. Repeated melting should not be used to eliminate defects.

Pay attention to the quality of the joint and the arc, note that the joint should be well fused, filling the weld pool when the arc is closed. Ensure the tightness of the weld seam. After the cover is finished, the surface of the weld should be cleaned and spattered.

Quality Standard:

Mechanical structure (GB/T12770-2002) is tested.

Defect types, cause analysis and improvement methods

Reasons and preventive measures for welding defects of argon arc welding caster bracket

Prevents the cause of welding defects. The argon gas is impure, the gas pipe is broken, or there is moisture in the gas path, use the tungsten electrode, transfer the metal dust to the molten pool to exchange pure argon gas, check the gas path, and the tungsten electrode is repaired or replaced.

The welding seam is well cleaned, the welding seam welding is not good, the welding speed is uneven, the technology is not skilled, the basic training is strong, the welding speed is uniform, the welding black ash is seriously oxidized, the argon gas flow is small, the welding speed is fast and slow, the temperature is high or the current is greatly increased. Air flow rate, speed up the welding speed, or improperly reduce the current shrinkage hole Arc discharge method is improper, the arc suddenly stops Change the arc receiving method, and increase the method welding speed stop crack Caster bracket welding temperature level, penetration is not good or excessive to ensure penetration , The current and welding speed should be appropriate, change the arc position without welding through the welding speed, the current is small, slow down the welding speed of the caster bracket or increase the current fusion is not good, the welding torch angle is not correct, or the welding speed is fast, the current is small, increase the corresponding Error, master the angle of the torch, appropriately slow down the welding speed, increase the current, burn-through technology is not proficient, the current is large or the welding speed is slow, reduce the current or speed up the welding speed, strengthen the work training, the welding seam surface damage is not accurate, grounding The line contact is not good, the arc should be accurate, there should be no arc on the surface of the weld, the ground wire is connected to the tungsten carbide electrode of the weld, the contact between the tungsten and the weldment is in the arc, and there must be a certain distance between the tungsten electrode and the workpiece. Welds are uneven. The speed of the gun is uneven.

Welding speed is not uniform. The welding speed is uniform. Wire feeding is more uniform.

The angle of the welding torch is incorrect. The temperature of the molten pool is incorrect. Both are unreasonable to adjust the wire to the angle of the torch to make the temperature of the molten pool even, pay attention to the position, time and speed of the wire feeding.