For body parts, especially those damaged by corrosion, galvanized metal is used. There is no need to remove the zinc layer before welding (clean only when soldering). Increase welding current by 10-30%, use hardened copper electrodes.
Precautions: When welding galvanized steel, toxic zinc oxide is produced, so ensure good ventilation of the workplace.
Neither welding nor soldering may be performed on parts of a charged air conditioning system. This also applies to welding and soldering work on those parts of the vehicle that may heat up the parts of the air conditioning system.
Caution: The refrigerant circuit of the air conditioning system must not be opened. If the refrigerant comes into contact with the skin, frostbite may occur.
When painting in a drying chamber or in a heated area, the vehicle must not be heated above 80°C, otherwise the vehicle's electronic control units may be damaged.
Plastic body protection should be removed in places using a rotating steel brush or it should be heated with a special hair dryer to approximately +180°C and scraped off with a spatula. It should be borne in mind that when burning or heating a material based on polyvinyl chloride, hydrochloric acid is formed, which strongly promotes corrosion, and in addition, harmful vapors are released.
Text taken from an online platform mazbook.ru