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What is the back gouge for, full pen joint? I do a lot of air arcing at work and I'm usually the one who has to dig out the defects that fail UT
![Proceso de Corte con Arco de Carbono y Aire. [CAC-A] - (aliazione)](http://i.ytimg.com/vi/HYgsBYr8BVE/mqdefault.jpg)
What is the back gouge for, full pen joint? I do a lot of air arcing at work and I'm usually the one who has to dig out the defects that fail UT