As the electric current is relatively large when soldering aluminum, the tungsten electrode is more likely to be dissipative at the long-lasted temperature. So the thicker tungsten electrode is advised to use. When using  a-c argon welder, turn down the current and use 3 cm electrode.

 

In addition to size, type affects too. It is noted that the component of tungsten electrode is distingushed by particular color code. When soldering aluminum / aluminum alloy, tungsten electrode with green head is well recommended. 

 

 

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