Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
41 00... Welding Steel Components
2011 BMW 528iSECTION 41 00... Welding Steel Components
IMPORTANT:
Comply with the following topics from "Body, General":
Safety regulations . See 41 00... SAFETY AT WORK or 41 00... INFORMATION ON HAZARDS .
Handling electrical system, electronics, airbags and restraint systems . See 41 00... HANDLING AIRBAGS AND RESTRAINT SYSTEMS or 41 00... HANDLING ELECTRICAL SYSTEM AND ELECTRONICS .
Safety regulations . See 41 00... SAFETY AT WORK or 41 00... INFORMATION ON HAZARDS .
Handling electrical system, electronics, airbags and restraint systems . See 41 00... HANDLING AIRBAGS AND RESTRAINT SYSTEMS or 41 00... HANDLING ELECTRICAL SYSTEM AND ELECTRONICS .
- General informationÂ
- The following procedures are used for repairs:
- MAG welding (MÂ etal AÂ ctive GÂ as welding)
- Resistance pressure spot welding (referred to in the following and in the repair instructions as spot welding).
- Take the number and position of welding spots and MAG weld seams from the separated part. Replace areas inaccessible to spot-welding tongs with MAG plug weldings at the same distance. Diameter of bore holes for plug weldings 8 mm.
- In the case of emissions extraction, observe a minimum distance of 30 cm for MAG welding during the welding process. Otherwise the inert gas would be drawn off.
- Follow the equipment manufacturer's instructions for use.
- The following procedures are used for repairs:
- Work materialsÂ
- MAG welding:
- Steel welder (see WORKSHOP EQUIPMENTÂ ).
- Steel welding wire - G3SI1 (SG2) or alternatively G4SI1 (SG3)
- Welding mask
- Gas bottle containing inert gas (82 % argon, 18 % CO2)
- Resistance pressure spot welding:
- Spot-welding apparatus (see WORKSHOP EQUIPMENTÂ ).
- Safety goggles
- MAG welding:
- Preparations for MAG and spot-weldingÂ
- Remove the paint coating in an area of approx. 30 mm around the weld seam or spot.
- The zinc layer underneath must be removed during the MAG welding method.
- It is not necessary to remove the zinc layer underneath during spot-welding.
- Remove the paint coating on the reverse side of the weld seam or spot.
- Contaminants will otherwise enter the weld pool via the root of the weld seam.
- An insufficient electron flow prevents an optimum spot-weld joint.
- Coat all metal overlaps and weld spot flanges with welding primer.
- To determine the optimum electrode contact force for spot-welding, carry out spot-weld shear tests on sample sheet metal.
- In order to keep the electron flow short during MAG welding on the body, you must if possible attach the ground terminal directly to the component to be welded.
- Remove the paint coating in an area of approx. 30 mm around the weld seam or spot.
- WeldingÂ
- During MAG welding, the weld gap must be kept as small as possible. The larger the weld gap, the lower will be the strength of the joint.
- During spot-welding, the sheet metal flanges to be joined must be placed as close together as possible without gaps.
The larger the gap, the lower will be the strength of the joint.
Minimum distance between welding spots 25 mm.
- Subsequent treatment of welded connections:Â
- When grinding a weld seam, do not grind thin the base material next to the seam.
- After joining, clean all weld seams and spots with a stainless steel wire brush.
- Remove burnt paint with a stainless steel wire brush.
- All welded connections sealed off with body sealing compound in original condition must be primed and sealed off again thoroughly after repairing. Replace damaged or removed anti-drumming layers.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.