What are the antistatic caster wheel bracket welding requirements

Antistatic caster wheel support welding requirement what before welding caster stents, welder must, in accordance with the 'test procedures' through the corresponding test of the specimens. It is strictly prohibited to any light on the surface of the welding arc, test current welding caster stents or temporary support. Should regularly check the welder use argon arc welding torch and argon gas pressure meter, to ensure that the argon is laminar argon arc welding seal. Before the interface should be clean grooves on the surface of the oil and base material of the wall and the outer wall, until a metallic luster. Clean range of 10 - on each side 15 mm, two side clearance of 2. 5 - 3. 5mm。 Interface clearance should be straight, powerful counterparts should be banned. The value of the error should be less than 10% of wall thickness and no greater than 1 mm. When the interface of the local clearance is too large, should be cut. Add the plug is strictly forbidden in the gap. According to the length of the interface, the interface after qualified, should be 4 Five points. Should be the same as the formal welding spot welding materials. Spot welding for 10 - length For 3-15 mm, thickness 4mm。 After completion of the bottom, should be examined at the bottom of the weld quality, and after confirm qualified for caster stents welding argon arc welding. Arc and arc must be conducted in the interface. Arc should be filled with molten pool and the groove of the arc should be directed to the extinguishing arc. Spot welding, argon arc welding and welding. If defects, must use electric grinder to remove it, and then continue to welding. Should not be used repeatedly to melt to eliminate defects. Attention to the quality of the joints and arc, pay attention to the joint bond should be good, the arc filling molten pool when closed. To ensure the weld sealing. After completion of the lid, should be clean and spatter weld surface. Quality standard: according to Q/ZB74 - quality 73 caster stents welding standard technical conditions and stainless steel castor welded pipe mechanical structure ( GB / T12770 - 2002). For testing. Argon arc welding defect types, cause analysis and improvement method caster stents welding defect reasons and preventive measures to prevent weld defects. Argon gas is not pure, tracheal rupture, or moisture, gas path using tungsten electrodes, metal powder transferred to the molten pool in the exchange of pure argon, check the gas path, tungsten electrode being repaired or replaced. Bad good cleaning, weld, welding, welding speed is not uniform, the technology is not skilled, strong basic training, welding speed even serious welding soot oxidation, argon gas flow is small, the welding speed is slow, high temperature or current greatly improve the argon gas flow rate, welding speed, or don't reduce the current local shrinkage hole arc discharge method is undeserved, change the arc arc suddenly stopped receiving method, and increases the method caster stents welding temperature, welding speed stop crack penetration is bad or far to ensure the penetration, current and welding speed should be appropriate, the position is changed by arc welding with welding speed, electric current is small, slow down the caster stents welding speed or increase the current fuse is not good, welding torch Angle is incorrect, or the welding speed, small current, improve the corresponding error, grasp the Angle of the cutting torch, appropriate to slow down the welding speed, increase the current burn through not proficient in technology, large current and welding speed is slow, reduce the current or accelerated welding speed, strengthen job training of weld surface damage is not accurate, the grounding line contact is not good, should be accurate, arc weld surface should not have arc, ground wire is connected to weld tungsten carbide, tungsten and in the contact between welding arc, tungsten electrode and the workpiece must have a certain distance. Uneven weld. The speed of the gun is not uniform. Welding speed is not uniform. Welding speed. Wire feeding more even. The Angle of the welding torch is not correct. The temperature of the molten pool is not correct. Neither reasonably adjust welding wire to the Angle of the welding torch, so that the temperature of the molten pool even, pay attention to the position of the wire feed, time and speed.