Welding method of frame type aluminum alloy body roof

Abstract

The invention discloses a method of welding a framed aluminum alloy vehicle body roof. The method includes the steps of welding a back side upper assembly, a left side upper edge beam assembly, a right side upper edge beam assembly, a roof front cross beam assembly and a rear water runner assembly successively; fitting all the above assemblies to a positioning tool, and fixing by spot welding; welding preset seams among the above assemblies to finally form the framed aluminum alloy vehicle body roof. Judging preset seam lengths is performed during welding; if the preset seam lengths are greater than a set length, symmetric backward welding or segmental skip welding is performed from the middle of each preset seam to its two sides; otherwise, welding from one end of each preset seam to itsother end is performed. The method herein can provide effectively reduced welding deformation and ensure seam quality and dimensional precision of a body vehicle roof.

Description

technical field [0001] The invention relates to the technical field of automobile body welding and processing, in particular to a welding method for a frame-type aluminum alloy body top cover. Background technique [0002] At present, lightweight materials are usually used to replace the original body materials to achieve lightweight materials. In view of the advantages of aluminum alloy materials with small specific gravity, high strength, good formability and low cost, aluminum alloy materials have become the first choice for lightweight materials. [0003] However, because the thermal conductivity of aluminum is three times that of steel and the linear expansion coefficient is large, and the heat input of aluminum arc welding is relatively high, the heat is excessively concentrated in the weld seam and the base metal area during the welding process, resulting in a large amount of welding stress and Residual deformation, resulting in serious deformation of the body parts a...

AI Technical Summary

Problems solved by technology

This processing method overcomes the problem that the products after stamping and welding of high-strength steel plates in the traditional iron plate stamping and welding process are bulky and the weight reduction effect is not obvious. It is easy to deform and cause the size to shrink in or out. In addition, the welding of the frame-type aluminum alloy sub-frame is integrally formed, which will lead to the problem of excessive welding heat input at a single station and cause large welding deformation, which is not easy Guaranteed dimensional accuracy

[0005] To sum up, it can be seen that the existing body welding methods cannot effectively prevent the large deformation of the aluminum alloy body roof during the welding process, and cannot effectively guarantee the quality of the weld seam and the dimensional accuracy of the body.

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