It has properties of hardening after malleablization,arc welding and impact resistance.It can grind but can not machining demagnitized steel-bonded carbide.
Double-frequency cipher can solve the problem of multimachine mutual interference fairly good by handling the remote control and autocorrection of welding current.
The product production line uses Japan, Europe, US and so on specialized automated, the semiautomation welding apparatus, each kind of product automatic production.
The system uses PLC procedure control, start-up, forward or backward soldering gun, arc starting, workpiece circumgyration, etc full welding process all can complete automatically.
The purpose of prebending process of longitudinal submerged arc welding pipe production line is introduced;character of roller prebending and mould press type prebending is analyzed.
The process of vacuum electron beam welding for rear-axle housing semiaxle of coach was introduced and the major problems in the process of welding was analysed.
The welding machine has strong anti-electricity fluctuation ability,it is available to produce in small quantity.At the same time,further research should be held on accurancy accouplement.
Air hole, burnthrough, cooapse and welding crackle occurred in the fixed overhead weld for aluminium and aluminium alloy tubes, above all the small-size thin wall tube.