Friction stir welding method for hot wire

Abstract

The invention discloses a friction stir welding method for a hot wire. The friction stir welding method comprises the following steps: step 1, cleaning a part to be welded, specifically, cleaning thesurface and a butt-joint surface position of the part to be welded, and avoiding residual impurities or pollutants at a gap; step 2, replacing a hot wire device, specifically, measuring the gap of thepart to be welded, replacing a hot wire device according to the gap, and meeting the filling requirement of the gap; step 3, filling the heated welding wire into the gap position of a welding joint of the part to be welded through a special hot wire filling device; carrying out primary stir extrusion on the filled hot wire through a rolling stir head, and promoting preliminary plastic bonding forthe hot wire and base metal; and carrying out friction stir on the hot wire subjected to the primary stir extrusion and the base metal through a welding stir head, promoting plastic migration and dynamic recrystallization between the hot wire and the base metal, realizing metallurgical bonding for the hot wire and the base metal, and completing friction stir welding for the part under a large-gapcondition. The large-gap condition refers specifically to that h is not less than 0.5d and not greater than 1.25d, wherein h is the width of the gap, and d is the thickness of the part.

Description

technical field [0001] The invention relates to the field of friction stir welding, in particular to a hot wire friction stir welding method. Background technique [0002] After more than 20 years of development, the friction stir welding technology has become increasingly mature, and the technology has included many technologies such as retraction friction stir welding, static shoulder friction stir welding, double rotation friction stir welding, and double shoulder friction stir welding. Welding materials are also expanded from non-ferrous metals such as aluminum alloys, copper alloys, and titanium alloys to ferrous metals such as steel and metal matrix composites. However, the development of the above-mentioned technologies and the expansion of the scope of applicable materials have not expanded the welding ability of friction stir welding under the condition of large gaps. Currently, friction stir welding is carried out under the premise of strictly controlling the gaps ...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that the current friction stir welding is difficult to be applied to parts welding under the condition of large gap, the invention provides a hot wire friction stir welding method, through filling the gap of the parts with the hot wire, and rolling the hot wire and the parts to be welded once And the subsequent friction stir welding, realize the friction stir welding of parts under the condition of large gap, and ensure the quality of the joint

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