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Limited welding seam manufacturing method for oblique Y-shaped groove crack welding test

A technology of groove welding and crack testing, which is applied in the direction of welding/welding/cutting articles, manufacturing tools, welding equipment, etc., can solve the problems of difficult removal, lower work efficiency, and manpower consumption, so as to save heavy work and reduce labor Strength, work efficiency improvement effect

Active Publication Date: 2015-05-20
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the shrinkage deformation of the weld seam exists objectively when welding the restrained weld seam, the plug piece is stuck in the welding test part after the restrained weld seam is welded, and the removal is very difficult, which consumes manpower and reduces work efficiency

Method used

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  • Limited welding seam manufacturing method for oblique Y-shaped groove crack welding test
  • Limited welding seam manufacturing method for oblique Y-shaped groove crack welding test
  • Limited welding seam manufacturing method for oblique Y-shaped groove crack welding test

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The base material of the weldment is 80mm thick ship plate and marine steel EH47, which is cut and blanked by a sawing machine, and the groove is processed by a planer and a milling machine according to the standard requirements. figure 1 to assemble.

[0023] Reserve 4.2mm gap between restrained welds, use Lincoln PowerWave 455M / STT multifunctional gas shielded welding machine for single-side welding and double-side forming STT mode for bottom welding, welding current 100-130A, welding heat input 5-8kJ / cm.

[0024] Filler welding is performed directly on the opposite side of the weld bead after rooting welding. The filling and cover welding adopt pulse MAG welding, the front and back sides are welded alternately, the welding current of the 1st-6th welding pass is 150~170A, the welding heat input is 15~20kJ / cm, the welding torch does not swing; the welding current of the subsequent welding pass is 200~230A, The welding heat input is 18-22kJ / cm, the welding torch swings...

Embodiment 2

[0027] The base material of the weldment is Q345R steel for pressure vessels with a thickness of 16 mm, and the groove processing and assembly of the weldment are the same as in the first embodiment.

[0028] Reserve 3.3mm for restraint weld seam gap, adopt 100% CO 2 Gas shielded welding is performed on the reverse side of the weldment, the welding current is 120-150A, and the welding heat input is 7-10kJ / cm.

[0029] After rooting welding, the reverse side of the weld bead is polished by a grinding wheel, and then fill welding is performed. 100% CO is used for filling and cover welding 2 Gas-shielded welding, alternating welding of front and back sides, welding current of all welds is 150-170A, welding heat input is 10-15kJ / cm, welding torch does not swing.

[0030] After the restraint weld is welded and the weldment is completely cooled, the gap between the test weld and the test weld is 2.1mm.

Embodiment 3

[0032] The base material of the weldment is 07MnNiDR steel for low-temperature pressure vessels with a thickness of 38mm, and the groove processing and assembly of the weldment are the same as in the first embodiment.

[0033] Reserve 3.9mm for restraint weld seam gap, adopt 100% CO 2 Gas shielded welding is performed on the reverse side of the weldment, the welding current is 110-140A, and the welding heat input is 6-9kJ / cm.

[0034] After rooting welding, the reverse side of the weld bead is polished by a grinding wheel, and then fill welding is performed. Electrode arc welding is used for filling and covering welding, the diameter of the electrode is 4.0mm, the front and back sides are alternately welded, the welding current of the 1st to 6th welds is 150-170A, the welding heat input is 14-17kJ / cm, and the welding torch does not swing; the subsequent welds are welded The current is 150-170A, the welding heat input is 20-25kJ / cm, the welding torch swings, and the width of t...

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Abstract

The invention discloses a limited welding seam manufacturing method for an oblique Y-shaped groove crack welding test. The method comprises the following steps that (1) groove machining: mechanical premachining is performed on a groove of a to-be-welded test piece; (2) weldment assembling: a gap d is reserved on a limited welding seam position, the d and the weldment thickness t satisfy the relation: d=4.32-1.92*exp(-0.0383*t), 9<=t<=100 mm; (3) welding: the welding currents of a backing weld range from 100 A to 150 A, when filling and cosmetic welding are performed, in order to prevent angular deformation, the front face and the back face are alternately welded until the welding is completed, the welding currents of a first weld pass to a sixth weld pass range from 120 A to 170 A, a welding gun does not swing, the welding currents of subsequent weld passes range from 120 A to 250 A, the welding gun can swing, and the width of the weld passes is controlled within 20 mm. The limited welding seam manufactured by the method has no weld defect, the weldment gap can be guaranteed without needing to insert a patch into the welding test position, the heavy work of dismantling the patch is left out, the labor intensity is reduced, and the working efficiency is improved.

Description

technical field [0001] The invention belongs to a test method for weldability of metal materials, in particular to a method for manufacturing restrained weld seams in an oblique Y-shaped groove welding crack test. Background technique [0002] The oblique Y-groove welding crack test has been widely used as one of the test methods for evaluating the weldability of metal materials, and has been included in the corresponding standards, such as BS EN ISO 17642.2-2005 Destructive tests for welding of metal materials - cold cracking tests for welding - Arc welding process - self-beam test, GB / T 4675.1-84 oblique Y-groove welding crack test method, etc. [0003] This method is mainly used to evaluate the susceptibility of metal materials to welding cold cracks, and restraint welds must be welded before welding test welds. According to the requirements of the standard, the welding restraint weld should prevent corner deformation and incomplete penetration, and ensure a 2mm gap at t...

Claims

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Application Information

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IPC IPC(8): B23K31/12B23K33/00B23K9/02
CPCB23K9/022B23K31/125B23K33/004B23K2101/18B23K2103/04
Inventor 郭慧英王纳张宇
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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