Manufacturing method for GTAW double-synchronization filler rod additive of non-closed thin-wall structural member

Abstract

The invention provides a manufacturing method for a GTAW double-synchronization filler rod additive of a non-closed thin-wall structural member. The non-closed thin-wall structural member is a multi-layer single-channel structural member which is not connected end to end. Wire feed systems are symmetrically mounted on the left side and the right side of a GTAW welding gun. When the welding gun moves along the stacking path, the same wire feed system serves a rear wire feed system when wire feed is conducted from the rear end of the welding gun and serves as a front wire feed system when wire feed is conducted from the front end of the welding gun, and the directions of stacking paths between adjacent stacking layers are opposite, so that on the different stacking layers, the wire feed system on the left side and the wire feed system on the right side alternately serve as the front wire feed system and the rear wire feed system, the wire feed amount of the front wire feed system and the wire feed amount of the rear wire feed system are adjusted independently, the front wire feed system is used for efficient wire fusion, and meanwhile a small amount of wire fusion is conducted through the rear feeding system. By the adoption of the manufacturing method, the problems that the wire fusion efficiency is low and the forming quality is poor by means of a rear wire feed manner in the non-closed structural piece alternate type stacking process are solved efficiently, the cooling rate of a fusion pool is increased effectively, grains can be refined, and the mechanical performance of formed components is improved.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and in particular relates to a double synchronous wire-filling additive manufacturing method for non-closed thin-walled structural parts GTAW. Background technique [0002] As we all know, the forming of metal parts basically adopts casting or traditional machining methods, but these methods inevitably have a series of problems such as low material utilization rate, poor structure and mechanical properties of formed parts, and high manufacturing cost. In recent years, the metal component additive manufacturing technology has emerged as the times require. This technology slices the STL model of the part in layers, and shapes each layer according to the set path until the entire metal component is manufactured. It has high material utilization rate and low manufacturing cost. advantage. [0003] Heat sources for additive manufacturing of metal components include lasers, electron bea...

AI Technical Summary

Problems solved by technology

The rear wire feeding method refers to the direction along the stacking path. The wire feeding system is installed behind the GTAW welding torch, and the wire is directly sent into the molten pool, and the wire feeding speed is greatly limited.

[0005] In the additive manufacturing of non-closed structural parts, if they are always stacked in the same direction, the size difference between the two ends of the formed part will gradually increase, so that the forming process cannot continue

If the staggered stacking method is used, that is, the stacking direction between adjacent layers is opposite, the post-feeding method is because the wire is fed into the molten pool, the wire feeding speed is limited, and it is difficult to fuse the wire efficiently.

At present, GTAW wire-filled additive manufacturing is mainly used to form closed structural parts, and there is no feasible solution for the forming quality control of non-closed path structural parts

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