Welding My Car. And a used car in the price range of 1500-2000 euros has a lot of pitfalls and risks too. Let the tack welds cool off.
Now you are ready to weld. Disconnecting the battery does not assure EM damage and actually can help prevent it by presenting a load to the input of the battery powered and attached devices mostly the ECU when the car is off. Once youre finished with the welds grind down the welds until they are flush with your vehicles surface.
This breaks the loop through the battery so that possible overvoltages are reduced.
Simply point the MIG gun and pull the trigger as you wave it back and forth until you fuse the edges of the joint together. How to Minimize the Risk When Welding. A cracked panel a rust patch or a puncture in the body of the car. I got a loan of a SIP MIG welder and tried with 0.