A Welding Method for Effectively Restraining Weld Toe Defects in Circumferential Welds of Medium and Heavy Plates

A technology of circular welds and welding methods, applied in welding equipment, manufacturing tools, arc welding equipment, etc., can solve problems such as safety hazards, structural fractures, welding defects, etc., and achieve high-strength welding, convenient operation, and strong practicability Effect

Active Publication Date: 2021-08-03
SHANDONG LINGONG CONSTR MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The weld seam of this structure is ring-shaped, and welding defects are prone to occur during welding, especially the four corners of the structure, which are stress-concentrated parts and are subject to large forces. Once welding defects, especially welding toe defects, are prone to structural fracture Phenomenon, resulting in serious security risks, this problem urgently needs to be resolved

Method used

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  • A Welding Method for Effectively Restraining Weld Toe Defects in Circumferential Welds of Medium and Heavy Plates
  • A Welding Method for Effectively Restraining Weld Toe Defects in Circumferential Welds of Medium and Heavy Plates

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with drawings and embodiments.

[0024] Such as figure 1 , figure 2 As shown, the welding process method for effectively suppressing the weld toe defect of the circular weld seam of the medium and thick plate described in the embodiment of the present invention includes the following steps:

[0025] a) Bevelling: The beveling angle of the rectangular tube is 45°, and the blunt edge is 2mm;

[0026] b) Fixing: rigidly fix the bottom plate before welding;

[0027] c) Preheating: After the arc is struck by the welding power source, the arc stops for a while, and the groove is preheated, and the wire feeding starts when the surface of the molten pool is slightly depressed;

[0028] d) Tack welding: the workpiece butt gap is ≤ 2mm, and the tack welding is performed on both end faces, and the tack welding height is ≤ 4mm;

[0029] e) Bottom welding: Bottom welding is performed on the groove, using singl...

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Abstract

The invention discloses a welding method for effectively suppressing weld toe defects in circular weld seams of medium and thick plates, belonging to the field of welding. It specifically includes the following steps: a) opening grooves; b) fixing; c) preheating; d) tack welding; e) bottom welding; f) filling cover welding; g) slow cooling after welding; Grinding; i) post-weld inspection; steps e) and f) of the present invention are completed in two welds for each layer of weld seam, and the arc starting and closing are at the end faces of the two ends of the rectangular steel, avoiding four corners, and effectively suppressing Occurrence of weld toe defects in circular welds of medium and thick plates. The invention has the advantages of simple process, convenient operation and strong practicability. Through the design of the welding process method, the high-strength welding of the circular steel structure of the medium-thick plate is realized.

Description

technical field [0001] The invention belongs to a welding method, in particular to a welding method for effectively suppressing weld toe defects in circular weld seams of medium and thick plates. Background technique [0002] The medium-thick plate annular steel structure on the arm of the loader bears alternating loads during use, and the strength of the welds is crucial. The weld seam of this structure is ring-shaped, and welding defects are prone to occur during welding, especially the four corners of the structure, which are stress-concentrated parts and are subject to large forces. Once welding defects, especially welding toe defects, are prone to structural fracture The phenomenon of serious safety hazards, this problem urgently needs to be resolved. Contents of the invention [0003] The object of the present invention is to provide a welding method for effectively suppressing weld toe defects in circular weld seams of medium and thick plates, so as to realize no w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/235B23K9/00
CPCB23K9/00B23K9/0026B23K9/235
Inventor 葛福华刘欢钟汝浩
Owner SHANDONG LINGONG CONSTR MACHINERY
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