1. TIG Welding
Tungsten Inert Gas Welding，short as TIG, is one of the most popular welding method.In TIG welding, the tungsten rods & weld piece are two electrodes, He or Ar as shielding gas, instantaneous high voltage current will cause great heat to melt down the filler rods and weld piece, in this way, the structural welding & repairing welding of aluminum alloys will be done.
It is featured with:
①Easy to operate, suitable for different welding situations with lower costs
②Small heat affected zone ensures minimum deformation and brings higher mechanical properties of weld bead
③Good & stable weldability, dense & beautiful weldbead can be achieved
2. GMAW
Gas Metal Arc Welding, short as GMAW, is also inert gas shield welding. But different from TIG, MIG welding uses filler metals themselves as electrodes.
In GMAW welding process, voltage & current act on filler metal electrodes, and cause instantaneous high voltage current to melt down the filler metal and grooves of weldbead. The molten metal of filler metal drops to the weld piece and form the weld bead
But aluminum alloy Mig welding is very limited to the poor feedability as aluminum alloy wires are too soft. Also in Mig welding, the molten metal may hang but not drop and this leads to spatters. Mig welding advantage over TIG welding is higher efficiency & smaller swaying range, and the welding efficiency can be meters every minute after adjusting wire feeding speed. 