Table of contents: Complete or partial removal of… ↓ Removal of contact welding spots ↓ Installing new parts ↓
Warning: Before proceeding with the removal of structural body parts that cannot be straightened, it is necessary to straighten the deformed section of the body as a whole to restore the original linear dimensions of the control points and to make sure that its geometric dimensions at the control points correspond to the table data.
Complete or partial removal of damaged parts
Complete removal of welded body parts is performed at the welding points, partial removal is performed by cutting out the deformed area. If the new part (part of the detail) if the parts are to be welded "overlapping", then it is necessary to provide an allowance of about 2 cm.
Removal of contact welding spots
Removal of contact welding points when removing damaged or deformed parts, the original shape of which cannot be restored by straightening directly on the car, is carried out using a pneumatic chisel or by drilling. Drilling of welding points is carried out using special milling cutters or drills with a centering protrusion, while the drill is sharpened so that the metal is cut from the periphery to the center.
Installing new parts
Warning: When performing any, even the smallest welding work on an undisassembled vehicle, it is necessary to disconnect the negative terminal of the battery from the ground and remove the electronic devices.
The body parts most susceptible to corrosion have a zinc protective coating applied by galvanic means. During welding, toxic zinc oxide is released, which requires the use of special respirators.
Welding of parts should be carried out primarily by contact welding or by electric arc in a protective gas environment (for example, carbon dioxide). The use of gas welding is not recommended.
The original article is available on the online resource AudiManual