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Metal joint welding process

A welding process and metal joint technology, applied in the field of metal joint welding technology, can solve problems such as low welding strength of joints, achieve the effects of improving welding quality, avoiding burn-through, and overcoming the difficulty of welding

Pending Publication Date: 2021-09-17
四川华川基业建设集团珑威容器制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem of low joint welding strength in the prior art, a metal joint welding process is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] On the basis of the above scheme, as one of the implementation methods, for weldments with plate thickness > 14mm: double-sided welding, root cleaning of the weld seam before back welding, longitudinal welding seam positioning welding length 30mm, circumferential welding seam positioning The welding length is 40mm; the tacking welding height is 4; the spacing is 250mm; if there is any incomplete fusion or incomplete penetration defect, remove it and reposition the welding, and trim its two ends into a gentle slope shape.

[0033] Preferably, each layer of arc welding of the weldment is less than or equal to the diameter of the electrode used + 2mm, and the single-pass welding width is less than or equal to 3 times the diameter of the electrode.

Embodiment 2

[0035] As one of the implementation methods, for weldments with plate thickness > 14mm: double-sided welding, root cleaning of the weld seam before back welding, longitudinal welding seam tacking welding length 50mm, circumferential welding seam tacking welding length 70mm; tacking welding height 6mm; the spacing is 350mm; if there are incomplete fusion or incomplete penetration defects, remove them and reposition them, and trim their ends into a gentle slope shape.

[0036] Preferably, each layer of arc welding of the weldment is less than or equal to the diameter of the electrode used + 2 mm, and the single-pass welding width is less than or equal to 4 times the diameter of the electrode.

[0037] For weldments with plate thickness > 14mm, the welding parameter setting and material selection can be implemented as follows:

[0038]

[0039]

[0040] Table 1

Embodiment 3

[0042] As one of the implementation methods, for weldments with a plate thickness of 8-14mm: the length of the tacking welding of the longitudinal weld is 20mm, the length of the tacking welding of the girth weld is 30mm; the height of the tacking welding is 3mm; the spacing is 180mm; if there is no fusion or penetration If there are any other defects, then reposition the welding after removal, and trim its two ends into a gentle slope shape.

[0043] Preferably, the thickness of deposited metal in each layer of weldment filling and covering layer is less than or equal to the diameter of the electrode used + 2 mm, and the single-pass welding width is less than or equal to 3 times the diameter of the electrode.

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Abstract

The invention discloses a metal joint welding process, belongs to the technical field of metal welding processes, and solves the problem of low joint welding strength in the prior art. The metal joint welding process comprises the following steps of: S1, drying and preserving heat of a welding rod and a welding flux before welding according to process requirements; S2, cleaning up water, rust, greasy dirt, accumulated slag and other harmful impurities on the surface and the two sides of a groove, and conducting submerged-arc welding for 20 mm at the distance from the edge of the groove; S3, positioning an arc starting plate and an arc stopping plate before welding, and conducting assembling, spot welding and welding according to process requirements; S4, for a weldment with the impact test requirement, controlling linear energy, wherein the linear energy of each weld bead is smaller than or equal to a qualified limit value; and S5, conducting self-inspection, and making welder symbol marks. The metal joint welding process is used for welding metal joints of containers, and the welded joint is high in welding seam strength, stable in quality and long in service life.

Description

technical field [0001] The invention belongs to the technical field of metal welding, and in particular relates to a metal joint welding process. Background technique [0002] A welded joint refers to the joint of two or more parts combined by welding, or the joint of two or more parts connected by welding, including welds, fusion zones and heat-affected zones. Fusion welded joints are formed by localized heating from a high temperature heat source. A welded joint consists of the weld metal, the fusion zone, the heat-affected zone, and the parent metal. [0003] The safest and most reliable connection method among metal joint connection methods is undoubtedly the welding connection. However, several existing connection methods have certain defects: [0004] (1) The connection strength is low: such as the socket welded connection, which is a lap joint, the weld is a fillet weld, and the working stress is the shear stress, which is calculated according to the allowable stre...

Claims

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Application Information

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IPC IPC(8): B23K9/235B23K9/18
CPCB23K9/235B23K9/18
Inventor 赖正清隆荣邹强彭小平曹刚
Owner 四川华川基业建设集团珑威容器制造有限公司