Things to ensure when doing TIG welding part 4

but maintaining that high voltage can lead to fluctuations in current that can damage the workpiece, so it’s important to adjust the voltage if necessary, or initiate the arc through some other method. Gas Flow – Since TIG welding requires an inert gas to shield the welding surface, gas flow and composition are important considerations. Different gases are selected based on the chemical properties of the filler metals and workpiece composition. Common choices are argon and helium (highly nonreactive gases that won’t oxidize underlying metals), oxygen, nitrogen, and hydrogen. It’s important for a welder to know which gases are appropriate for which metals, as choosing the wrong one can severely affect the quality of the weld (making the piece unusable) –