Circular seam welding tool for enclosed container

Abstract

The invention discloses a circular seam welding tool for an enclosed container. The circular seam welding tool is provided with a barrel body fixture, an end cover fixture and a planar slide block mechanism, wherein the planar slide block mechanism consists of a plurality of components taking planar slide blocks as connecting pieces, can extend outwards in a plane according to a certain moving track, and can be used for clamping the barrel body of a workpiece and the inner and outer walls of an end cover by cooperating with the barrel body fixture and the end cover fixture; the planar slide block mechanism is provided with an inner cooling block assembly acting on the inner wall of the workpiece; a protection groove is formed in the middle of each cooling block; a plurality of air outlet holes which are communicated protective gas are distributed in the protection grooves; the barrel body fixture and the end cover fixture are provided with outer cooling blocks acting on the outer wall of the workpiece. By adopting the circular seam welding tool, the phenomena of seam corrosion and over oxidation of welding seams in the conventional circular seam overlap welding are avoided, and superior quality performance, high efficiency and reliability are achieved. The circular seam welding tool is suitable for argon tungsten-arc welding of the circular seam butting structures of sheet enclosed containers of various shapes.

Description

Technical field [0001] The invention relates to a welding tool, which is suitable for circular seam welding of airtight containers, especially suitable for circular seam welding of stainless steel sheet airtight containers, and belongs to the technical field of welding equipment. Background technique [0002] Circular seam welding of stainless steel airtight containers, especially the welding of thin plate airtight containers below 3mm, is difficult to achieve circular seam butt welding because the thin plate itself has a small degree of restraint and is easy to deform, and the welding butt contact end face is small. In addition, due to the small thermal conductivity of stainless steel (about 1 / 3 of that of ordinary low-carbon steel), and the large linear expansion coefficient, the thermal stress generated when the welding temperature changes rapidly is much larger than the stress existing at normal temperatures. It is prone to welding deformation, and serious defects such a...

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Problems solved by technology

[0002] Circular seam welding of stainless steel airtight containers, especially the welding of thin plate airtight containers below 3mm, because the thin plate itself has a small degree of restraint and is easy to deform, and the welding butt joint contact end face is small, so it is difficult to achieve circular seam butt welding

In addition, due to the small thermal conductivity of stainless steel (about 1/3 of that of ordinary low-carbon steel), and the large linear expansion coefficient, the thermal stress generated when the welding temperature changes rapidly is much larger than the stress existing at normal temperatures. It is prone to welding deformation, and serious defects such as burn-through are more difficult to avoid when welding thinner plates (below 1mm)

[0003] Based on the above reasons, two common technical defects will be encountered in the production of circular seam welding of stainless steel thin plate airtight containers: (1) Because the plate is too thin and easy to deform and burn through, the production is realized in the form of lap joints Girth welding

However, lap joints will produce structural gaps, resulting in crevice corrosion of steel and reducing the service life of welded products

(2) For the welding of the circular seam of the airtight container, especially the welding of the end cap and the barrel section of the airtight container, it is difficult to real

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