Welding joint and technique for longitudinal seam and circumferential seam of medium-thick plate

A technology of circumferential seam welding and process, applied in welding equipment, welding accessories, manufacturing tools, etc., can solve the problems of low welding efficiency and long processing time, and achieve the effect of improving welding quality, reducing welding quantity, and improving root cleaning efficiency.

Inactive Publication Date: 2017-12-08
LUXI IND EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the deficiencies in the above-mentioned prior art, an object of the present invention is to provide a longitudinal and circumferential welded joint of a medium-thick plate, which solves the problems of long processing time and low welding efficiency of the plate or barrel joint of the medium-thick plate equipment, It reduces the filling amount of welding consumables and the labor intensity of welders, improves the welding quality and greatly improves the welding efficiency

Method used

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  • Welding joint and technique for longitudinal seam and circumferential seam of medium-thick plate
  • Welding joint and technique for longitudinal seam and circumferential seam of medium-thick plate
  • Welding joint and technique for longitudinal seam and circumferential seam of medium-thick plate

Examples

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Effect test

Embodiment 1

[0042] One material is S32168, and the specification is Φ4400×72 austenitic stainless steel welded joint:

[0043] The thickness of the stainless steel plate is 72mm, and the groove of the joint is a "V" type internal groove and a "U" type external groove. The roots of the internal groove and the external groove overlap, and the groove depth of the "V" type groove is 40mm, unilateral angle of groove is 20°, root cleaning depth of "U" type groove is 40mm, arc of root is R=8mm, unilateral angle of groove is 8°.

[0044] One material is S32168, the specification is Φ4400×72 austenitic stainless steel welding method is as follows:

[0045] 1. The internal groove of the cylinder adopts V-shaped groove, and the groove is processed by mechanical processing methods such as edge milling machine. The single side angle of the groove is 20°, and the groove depth is 40mm. The processing form is as follows figure 1 shown.

[0046] 2. Clean up impurities such as oil stains and rust within ...

Embodiment 2

[0054] One material is Q345R, the specification is Φ5200×40 low-alloy steel welded joint:

[0055] The thickness of the stainless steel plate is 40mm, and the groove of the joint is an internal groove "V" type and an external groove "U" type groove. The roots of the internal groove and the external groove overlap, and the groove depth of the "V" groove is The angle of one side of the groove is 30mm, the angle of one side of the groove is 20°, the root cleaning depth of the "U" type groove is 20mm, the arc of the root is R=8mm, and the angle of one side of the groove is 8°.

[0056] One kind of material is Q345R, the specification is Φ5200×40 low-alloy steel welding method is as follows:

[0057] 1. The internal groove of the cylinder adopts V-shaped groove, and the groove is processed by mechanical processing methods such as edge milling machine. The single side angle of the groove is 22°, and the groove depth is 30mm. The processing form is as follows figure 2 shown.

[00...

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Abstract

The invention discloses a welding joint and technique for a longitudinal seam and a circumferential seam of a medium-thick plate. The welding technique for the longitudinal seam and the circumferential seam of the medium-thick plate comprises the following steps that a groove inside the plate is machined; then, the surface and the two sides of the groove are cleaned; a priming layer, a filling layer and a surface covering layer of the internal groove are welded in a submerged-arc welding mode; then mechanical back chipping is conducted, and the back-chipped groove is detected nondestructively; and finally, a priming layer, a filling layer and a surface covering layer of an external groove are welded in a submerged-arc welding mode. By optimizing the groove type, the welding material filling amount is decreased, and the welding efficiency is improved; groove machining and welded seam back chipping are conducted through mechanical back chipping, base material hardening caused by rapid heating and cooling through carbon arc air gouging back chipping is avoided, the carburization phenomenon on the two sides of the groove of a stainless steel material is avoided, secondary polishing caused by using of a polishing machine is avoided, the back chipping efficiency is improved by about 50%, the labor intensity of workers is greatly reduced, the air environment is improved, and the welding quality of a cylinder is improved.

Description

technical field [0001] The invention relates to a welding process, in particular to a longitudinal and circular seam welded joint of a medium-thick plate cylinder with a thickness of more than 25 mm and a welding process. Background technique [0002] In recent years, with the rapid development of chemical technology, harsh conditions such as high temperature and high pressure have become more and more common, and the production and application technology of medium-thickness containers has become more and more mature. The welding technology of medium-thickness equipment has also become a constraint for the development of enterprises. important influencing factors. [0003] The welded joints of traditional medium-thick plate pressure vessels generally adopt double V-shaped grooves with a single side angle of 30° to 35° or double U-shaped grooves with a single side angle of 8°. Generally, machined plates or cylinders are used. The joint groove is welded on both sides. After t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/02B23K9/18B23K9/235B23K9/32B23K33/00
CPCB23K9/02B23K9/18B23K9/235B23K9/32B23K33/00
Inventor 张文明黄孝鹏邹伟周忠文许文文王凯威
Owner LUXI IND EQUIP
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