Aluminum busbar bus pipe conductor usually use aerial installation after welding (aluminum and aluminum alloy pipe welding way similar), after the overhead pipe type conductor adopts special bus hardware is fixed, because the strength of the joint is reduced after welding (about 65% of the parent metal), to avoid the overhead in using bent after joint, joint internal liner was used to reinforce, two pillars between the welding head should not be more than two.
Common welding methods of aluminum busbar bus pipe are as follows:
Argon arc welding (MIG welding), argon arc welding is under the protection of argon, using ac or dc welding power source, through the refractory tungsten as the non-melting electrode, make it produce arc with the workpiece, to melt the filler material and the workpiece interface for welding.Compared with welding, it has the advantage of heat concentration, arc stability, molten metal can get the good protection of argon gas, avoid the oxidation, and oxide film on the surface of the molten metal can be removed by argon arc to be without welding flux, so both can get less defects and pure quality of weld, and can grasp the welding technology and can make all position welding.
1.2 argon requirements
The purity of argon should be above 99.9%, including impurity oxygen less than 0.005%, hydrogen less than 0.005%, water less than 0.02mg/L and nitrogen less than 0.015%.The increase of oxygen and nitrogen will worsen the atomization of cathode.More than 0.3% oxygen will aggravate the tungsten electrode burning loss, more than 0.1% oxygen will make the weld surface dull or black.More than 0.05% of nitrogen pool fluidity becomes bad, welding surface formation is bad.
