Diesel engine rack single-piece double-face double-arc synchronous gas shielded welding process

Abstract

The invention discloses a diesel engine rack single-piece double-face double-arc synchronous gas shielded welding process, solves the problems of diesel engine rack single-piece poor welding seam quality and low production efficiency in the prior art, and has the beneficial effects of ensuring the welding seam quality and realizing full penetration welding without leaving a gap. According to the specific scheme, the diesel engine rack single-piece double-face double-arc synchronous gas shielded welding process comprises the steps that diesel engine rack single-piece protection is conducted through protection gas in the backing welding process so as to ensure that base metal for backing is melted, and argon and carbon dioxide in the set proportion serve as the protection gas in the filling welding and capping welding process, so that welding spatter is avoided in the forming and welding process of each layer of welding seam, and welding currents are different in the backing welding, filling welding and capping welding processes.

Description

technical field [0001] The invention relates to the field of diesel engines, in particular to a single-chip double-sided double-arc synchronous gas-shielded welding welding process for a diesel engine frame. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] At present, the existing research on double-sided double-arc welding of robots is mainly divided into two types. One is to reserve a gap at the root, and pulse TIG welding with good arc stability is used for the bottoming. The arc melting ability during the peak period is strong, and the groove root The edges on both sides melted well, and the melt pool solidified quickly during the base value, preventing dripping. Double TIG arcs are used for synchronous bottoming. The addition of the rear arc leads to an increase in the high temperature area of ​​the workpiece between the two arcs, and...

AI Technical Summary

Problems solved by technology

Double TIG arcs are used for synchronous bottoming. The addition of the rear arc leads to an increase in the high temperature area of ​​the workpiece between the two arcs, and the elongation of the molten pool of the front arc. The filling welding cover is welded by double-sided double-arc synchronous gas shielded welding, and the actual use of robots is applied. During the process, when the bottoming and filling welding bead is replaced, the welding method needs to be changed, and the production efficiency will be greatly reduced, which is not suitable for production

[0004] The other is to use gas-shielded welding with dislocation bottoming. The arc stability of gas-shielded welding is poor. During the welding process, the molten pool will be affected by various forces such as surface tension, electromagnetic contraction force and gravity. The groove, shielding gas and welding wire Slight changes in the dry elongation will cause changes in welding parameters, resulting in changes in the transition form of the arc, often with a low pass rate for one-time inspection, and poor practicability for actual production and use.

[0005] Thus, the inventor found that the existing two welding methods have the problems of low production efficiency and poor weld seam quality resulting in low pass rate

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