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Carbon dioxide welding to repair auto parts

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The significance of automotive parts repair is to repair old and waste, reduce the consumption of new parts, thereby saving raw materials, energy and manpower for manufacturing parts.

The damage of automobile parts mainly includes four types: deformation, fracture, corrosion and wear. The first three types of damage are usually repaired by cold working, hot working or gluing. If the general parts deformation can be cold-pressed or hot-pressed after correction for mechanical repair; shaft parts can be broken by inlaying, welding, forging and other methods to repair; cylinder block water jacket cracks can be repaired by welding, riveting or adhesive methods. Parts wear is the most common damage. Parts that have not worn out beyond the specified repair size are processed according to repair size. Parts that have worn out beyond the repair size are repaired by surfacing, spraying, electroplating and other metal covering processes and adhesive methods.

Automatic surfacing is to install parts on the surfacing machine and turn them on side. Commonly used automatic surfacing has three technologies: vibration surfacing, carbon dioxide protection welding and submerged arc welding.

Carbon dioxide protection welding is carried out under the covering of carbon dioxide gas. Because carbon dioxide can react with carbon in molten iron to form carbon monoxide at high arc temperature, some carbon monoxide gases escaped from molten iron pool and become pores in the welding layer, thus affecting the surfacing quality.  Therefore, in order to reduce the porosity, carbon dioxide shielded welding mostly uses special low-carbon manganese-silicon alloy steel wire with low carbon content and sufficient deoxidizer. The wire diameter is 0.4-0.6 mm. The surfacing layer has high strength, few pores and no cracks, but the hardness is low. This method is suitable for repairing cab, leaf plate and other thin plate parts.

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