If you don’t produce any spatter during welding, you don’t have to clean anything afterwards – but this product of choice costs 25 cents.
Sometimes you need force: For example, when slotted screws in light metal have seized up.
Exhaust silencers are rarely so irreparably damaged that they cannot be welded.
All you need is a shielding gas device and some sheet metal.
Thread torn out? No material around the hole for cutting to size or for a Insert Nut? Then the time has come for Helicoil!
If welding electrodes become damp, they will no longer ignite and burn properly.
Put them in the oven!
External thread broken and no die to hand? No thread file? Nothing? Then it’s time for the slotted cutting nut.