By 803056 
Date 02-10-2017 14:39
Edited 02-10-2017 18:34
Arc burns, arc strikes, they are both the result of an arc that momentarily melts the base metal without proper shielding and uncontrolled cooling. The causes; inadvertently striking the electrode outside the weld, loose workpiece connection (ground clamp for the technically challenged), prods used for magnetic particle testing, welding leads with damaged or breached insulations, etc. Even an extension cord that has exposed wires can cause an arc strike. They can be obvious if they are severe or they can be overlooked if they are small. In any event, the issue is the same, the degree or damage can vary.
Arc Strikes are usually very visible, so you should be able to see them. If the welder strikes his arc in the joint and not out on the base material outside of the joint, there shouldn't be any visible arc strikes.
