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Automatic welding method of loop-weld structured but joints

An automatic welding and butt joint technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problem of poor welding quality

Inactive Publication Date: 2015-04-29
SHANGHAI SPACE PRECISION MACHINERY RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The problem solved by the invention is that the welding process of the existing weld seam structure is stable and the welding quality is not high

Method used

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  • Automatic welding method of loop-weld structured but joints
  • Automatic welding method of loop-weld structured but joints
  • Automatic welding method of loop-weld structured but joints

Examples

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Embodiment 1

[0034] This embodiment provides a high-quality automatic welding method for circular seam structure butt joints. The workpiece to be welded is a 30CrMnSiA steel component with a thickness of 8mm, the inner diameter is a sudden change structure, the inner diameter of the nozzle is 5mm, and the inner diameter of the welded part is 40mm. Defects cannot be repaired, and the welding success rate is high.

[0035] It is used for the production of two-part circular seam structure butt joints with a length of 700mm, such as figure 2 and image 3 As shown, the present embodiment proceeds according to the following steps:

[0036] 1) Process the butt surface of the parts to be welded into a Y-shaped groove, the thickness of the blunt side of the groove is 2mm, and the angle of the single-side groove is 45°.

[0037] 2) Carry out positioning welding, use V-shaped high-speed iron to make the cylindrical structural parts to be welded coaxial, fill the back of both ends with argon gas pr...

Embodiment 2

[0046] The preferred embodiment of the present invention provides a high-quality automatic welding method for circular seam structure butt joints. The welded 20 steel components with a thickness of 4mm and a diameter of 100mm are two pipe parts with a length of 1200mm.

[0047] Difficult to access inside for rework due to long length. Such as Figure 4 , Figure 5 As shown, the present embodiment proceeds according to the following steps:

[0048] 1) The butt surface of the parts to be welded is processed into a stepped groove, the thickness of the blunt side is 1.3mm, and the width of the blunt side of the single slope is 4mm. The upper bevel angle is 45°

[0049] 2) Carry out positioning welding, use V-shaped high-speed iron to make the cylindrical structural parts to be welded coaxial, fill the back of both ends with argon gas protection, use special plugs for sealing at both ends, one end of the plug is externally connected to the intake pipe, and the other end of the p...

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Abstract

The invention discloses an automatic welding method of loop-weld structured but joints. The automatic welding method includes machining an edge before welding, positioning before welding and protectively preheating before welding; adjusting the position of a welding gun after assembly so as to enable the welding gun to be above a weld bead; self-melting, bottoming and welding; welding a cover surface; slowing down cooling and successively treating thermally and the like. The automatic welding method can realize bottoming and cover surface welding formation of the loop weld structure 4-12 mm in thickness, production efficiency is improved by 200-300%, and one-time welding success rate of products is greatly increased.

Description

[0001] technical field [0002] The invention belongs to the field of welding technology, and in particular relates to an automatic welding method suitable for butt joints of circular seam structures of metal materials. Background technique [0003] Large-thickness metal materials have been widely used in the aerospace field, especially the welding of circular seam structures often requires the use of multi-layer and multi-pass welding welding processes. Due to the high dependence on welder skills, manual welding is difficult to ensure quality stability, and for structures with a large middle and small diameter at both ends, it is extremely difficult to repair the bottom layer defects after welding. For example, for a circular seam with a diameter of 20mm, the thickness In the welding of butt joints with a diameter of 7mm, defects such as poorly formed back welds and incomplete penetration often occur. However, due to the small diameter at both ends of the workpiece and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/032B23K9/235B23K9/167
CPCB23K9/028B23K9/167B23K9/235
Inventor 张国军朱迅强姚徐伟顾国荣罗志强黎朝晖张凤艳李国钧
Owner SHANGHAI SPACE PRECISION MACHINERY RES INST
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