Sheet welding method

Abstract

The invention discloses a sheet welding method which comprises the following steps of: assembling sheets on a support device, wherein at least three sheets are in butt joint to form at least two butt-joint grooves; tack-welding the butt-joint grooves, and fixing the sheets; pressing and clamping the sheets on the support device with a fixture; adjusting the welding technological parameters of a welding gun; and welding the sheets, wherein two welding guns perform equidirectional symmetric welding from the middle butt-joint groove towards the butt-joint grooves on the two sides. In the invention, two welding guns are adopted to perform equidirectional symmetric welding from the middle butt-joint groove towards the butt-joint grooves on the two sides. Through the invention, the stress produced by the sheets during the welding can be effectively balanced, and the heat can be quickly dispersed so that the deformation of the welded sheets is more uniform, the deformation generated by the welding of large-size sheets can be reduced, the regulation and maintenance workload after welding is reduced, and the production efficiency is improved.

Description

technical field [0001] The invention relates to welding technology, in particular to a plate welding method. Background technique [0002] Sheets include flat sheets or curved sheets, flat sheets include flat sheets and flat profiles, and curved sheets include curved sheets and curved profiles. In engineering applications, it is necessary to weld multiple flat or curved panels into large-sized panels, which are used as outer skin materials for trains, ships or aircraft. [0003] In the prior art, the welding method of large-sized sheet metal is to assemble multiple sheets butt joints to form a butt groove, and use one welding torch and one welding wire for welding (single-gun single-wire welding), or use one welding torch and two welding wires. Root welding wire (single gun double wire welding). [0004] When welding large-size profiles in the prior art, the efficiency of single-gun single-wire welding is low, and welding is performed along each butt joint groove in turn. ...

AI Technical Summary

Problems solved by technology

[0004] When welding large-size profiles in the prior art, the efficiency of single-gun single-wire welding is low, and welding is performed along each butt joint groove in turn. After welding, the large-size sheet metal is deformed and the workload of adjustment and repair is large.

[0005] Although the single-gun double-wire welding is fast, a single gun can only weld one seam at a time, so the welding efficiency is low, and the deformation of the large-size sheet after welding is also large, and the workload of adjustment and repair is large.

[0006] It can be seen that the sheet metal welding method in the prior art, whether it is single-gun single-wire welding or single-gun double-wire welding, because the weld seam is very long, the stress generated between the sheets during welding cannot be effectively balanced, and local Deformation, due to the accumulation of deformation, the larger the deformation of the weld on both sides, it seriously affects the flatness or contour of the sheet after welding, the workload of adjustment and repair is large, and the production efficiency is low

[0007] Moreover, due to the use of single-gun single-wire welding or single-gun double-wire welding, each weld seam is welded sequentially, and the welding efficiency is low

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