Welding technology of automobile body

In real life, some people don't know much about figure, frame and basic technology. Let me briefly introduce the basic technology, materials and welding technology of automobiles.

The basic process of car body must understand the manufacturing materials of car body and the welding process of car frame, so as to choose the appropriate sheet metal maintenance method.

The difference between modern cars and traditional cars in body materials and frame welding technology leads to the change of maintenance methods.

Body material

For example, BMW, the traditional frame body is mainly low carbon steel or medium carbon steel. When welding and cutting, a pneumatic body saw should be used. If the traditional oxygen-acetylene cutting is used, it will do great harm to the body.

The whole body frame of modern BMW usually adopts high-strength steel or alloy materials, and the repair of structural parts needs CO2 gas shielded welding, inert gas shielded welding or spot welding.

The selection of welding methods and related technical parameters will vary with the change of steel plate thickness and alloy composition of body materials, which requires familiarity with BMW body materials for reasonable maintenance.

R maintenance skills:

After the car is damaged by collision, it must be stretched in all directions, and heating should not be used as much as possible to prevent the internal structure of metal from changing, which will lead to the reduction of strength and the inability to effectively protect passengers when the car collides again.

Body welding technology based on

(1) Welding method In terms of frame welding technology, modern BMW body repair generally adopts fusion welding, pressure welding and bonding, while covered electrode arc welding and oxyacetylene gas welding, which once dominated body repair, should be used cautiously in modern body repair.

A. covered electrode arc welding is only used to repair the frame and low carbon steel body.

B oxygen-acetylene gas welding, pressure welding and bonding are only used in some special processes.

(2) The welding of the new aluminum body needs to adopt the welding process specified by BMW to repair the new aluminum body. The welding method of BMW T IS should be adopted when repairing the body sheet metal parts. This welding method is the best welding method that will not reduce the original strength and durability of the car body, and the repairman needs to be familiar with the welding process used by all parts of BMW. @20 19