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Welding To Car Frame. Unless you drive a pickup or an old vehicle it is very unlikely that your car has a separate frame. Rosette weldspot weld minimum four spots per side of each rail plus leave about 18 gap between rails with a bevel on rails to make full penetration with sleeve when fully welded together.
Secondly you want to stay within the parameters of the law. Welding to a frame repairing a damaged frame and truck frame modifications can cause weakness and compromise the integrity of the vehicle. And finally always be careful of distortion.
I have assumed the car battery voltage is 12V and the welder voltage is 100V.
I have assumed the car battery voltage is 12V and the welder voltage is 100V. The number one rule for welding technique on a vehicle frame is to avoid a single vertical butt joint where the two halves of a frame are joined together from top to bottom with a single weld. The two most viable options for welding car frames are the TIG and MIG welding processes. Welding on your automobile can severely damage the electronic components in the car and even make your airbags fire.