Ultra-narrow gap TIG (tungsten inert gas) hot wire welding method

Abstract

The invention provides an ultra-narrow gap TIG (tungsten inert gas) hot wire welding method. The method comprises steps as follows: S1, a groove of a window plate test plate is subjected to machining and assembly work before welding; S2, the window plate test plate is preheated; S3, backing-welding weld bead configuration for the ultra-narrow gap TIG hot wire welding is performed; S4, backing welding parameters are set, and backing welding is performed. According to the ultra-narrow gap TIG hot wire welding method, the problem that the backing welding is difficult and consumes long time during ultra-narrow gap TIG hot wire welding of the window plate is emphatically solved, and the welding defects of incomplete side wall fusion, discontinuity of weld beads, poor weld seam formation and the like generated in the welding process easily are overcome. Therefore, high-efficiency and high-quality ultra-narrow gap backing welding of the window plate is realized; the welding quality and the welding efficiency are improved, the working environment is improved, the preheating frequency is reduced, the production cost is reduced, and high use value and economic benefits are achieved.

Description

technical field [0001] The invention relates to the field of marine engineering equipment, in particular to an ultra-narrow-gap hot wire TIG welding method, which is applied to the welding manufacture of pile legs of large-scale marine steel structures. Background technique [0002] In the field of offshore engineering equipment, pile legs are key components of large offshore steel structures (such as jack-up offshore oil drilling platforms), and their welding quality will directly affect the safety and stability of large offshore steel structures. Since the welding of the pile legs belongs to the welding category of high-strength steel (Q690 grade) large thick plates (the thickness of the window plate of the 400ft jack-up drilling platform leg is 82.55mm), its welding manufacturing is difficult and inefficient. [0003] The traditional process adopts the manual arc welding method for welding. Preheating is required before welding, and multi-layer and multi-pass welding is u...

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is to provide an ultra-narrow gap hot wire TIG welding method in order to overcome the defects of high difficulty in traditional hot wire TIG bottoming welding operation and poor processing accuracy in the prior art

Images