[header] How to torch weld [title] Put on protective clothing, including long pants and shirt, welder's gloves and eye protection. [title] Work in an open space free of any flammable materials. [title] Turn on the fuel adjustment knob. 
[step] The knob is located on the shorter of the 2 tanks on the torch. Turn the knob slowly, about 1/2 inch (1.3 cm), to release the gas.