Adapter mechanism and a related system for a welding apparatus

A system for a welding apparatus, comprising:

• a welding cup having opposed first and second ends;
• a hollow tubular adapter body extending longitudinally from a first end to a second end, an external surface of the adapter body defining a pair of grooves extending about a circumference thereof and longitudinally disposed between the first end and second end;
• and
• a pair of O-rings, each configured to be installed about the adapter body and received in each of the grooves;
• wherein the first end or the second end of the adapter body is engageable with a welding torch head and wherein one of the first and second ends of the welding cup is configured to receive the other of the first end and the second end of the adapter body therein, the welding cup extending longitudinally along the adapter body such that the pair of O-rings is disposed between the adapter body and the welding cup and said adapter body is entirely disposed internally within said welding cup.