Horizontal position welding method and system for austenitic stainless steel bottom-locking structure

Abstract

The invention discloses a horizontal position welding method for an austenitic stainless steel bottom-locking structure. The horizontal position welding method sequentially comprises the following steps of, preparing a austenitic stainless steel structure; carrying out pretreatment; installing a horizontal position welding system; adjusting the welding position, specifically, adjusting the included angle theta between the axis of a tungsten electrode bar and a horizontal line to be 10-15 degrees, and adjusting the distance L between the end of the tungsten electrode bar and the surface of the austenitic stainless steel structure to be 3-5 mm; and staring welding. The invention further discloses a horizontal position welding system for the austenitic stainless steel bottom-locking structure. A high-frequency pulse welding power source is electrically connected with a control cabinet, an industrial robot and an argon arc welding torch, the control cabinet is electrically connected with the industrial robot, the argon arc welding torch is fixed to the industrial robot, a tungsten electrode bar is fixed to the argon arc welding torch, the angle theta between the axis of the tungsten electrode bar and the horizontal line ranges from 10 degrees to 15 degrees, and the distance L between the end part of the tungsten electrode bar and the surface close to the austenitic stainless steel structure is 3-5mm. According to the horizontal position welding method and system for the austenitic stainless steel bottom-locking structure, the welding cost is reduced, the welding process requirement is lowered, and the forming quality of a welding seam is improved.

Description

technical field [0001] The invention relates to the technical field of welding methods, and more particularly to a horizontal welding method and system for austenitic stainless steel locking bottom structure. Background technique [0002] In industrial manufacturing, there are a large number of austenitic stainless steel workpieces with double-layer composite structure design. In order to ensure airtightness and reliability, such structures cannot be perforated welding, and need to use locking bottom welding. Due to environmental limitations, only the welding position of the horizontal welding position is often used when welding such workpieces. Affected by the poor thermal conductivity of austenitic stainless steel and the poor fluidity of the liquid molten pool, when welding the austenitic stainless steel lock bottom structure, the installation gap between the double-layer structures will affect the heat transfer of the molten pool, and the horizontal welding will also cau...

AI Technical Summary

Problems solved by technology

Affected by the poor thermal conductivity of austenitic stainless steel and the poor fluidity of the liquid molten pool, when welding the austenitic stainless steel bottom lock structure, the installation gap between the double-layer structures will affect the heat transfer of the molten pool, and the horizontal welding will also cause The heat of the molten pool is difficult to transfer to the underlying structure of the workpiece, which makes it difficult to guarantee the penetration depth of the workpiece

The application of high-energy beam welding methods such as plasma welding and laser welding is limited due to the easy instability in the installation gap of the double-layer structure, while the arc energy dispersion of the ordinary DC argon arc welding method requires a huge heat input In order to ensure sufficient penetration depth, it is very easy to cause the deterioration of the structure and performance of the workpiece, and the simple use of increasing heat input will increase the volume of the molten pool, which will cause the molten pool to collapse during horizontal welding and form undercut defects. Therefore, It is also necessary to adopt methods such as beveling and wire filling, which further increase the welding cost and welding difficulty

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