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Welding method of full penetration overhead plate

A welding method and full penetration technology, applied in the field of steel material welding, can solve the problems of high labor intensity of welders, scalding probability, easy formation of welding flashes, etc., so as to reduce welding production cost and labor intensity of workers, improve welding efficiency, The effect of improving production efficiency

Inactive Publication Date: 2020-07-03
INST OF RES OF IRON & STEEL JIANGSU PROVINCE +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During supine welding, due to the upside-down welding molten pool, there is no support of solid metal, which makes it difficult to form the weld seam
If the plate assembly gap, welding torch angle, welding current, arc length, and strip transportation method are not properly controlled, CO 2 When the gas shielded welding is welding in the supine position, the droplet metal and liquid metal in the molten pool are prone to slump due to the action of gravity. Welding is easy to form on the front of the weld, and slag inclusions are easy to form at the angle between the weld and the two sides of the groove. Defects such as concave and incomplete penetration can easily lead to unqualified weld flaw detection
However, the use of electrode arc welding to weld the upper plate has slow work efficiency and high labor intensity for welders. During the welding process, the amount of dust and dust generated by the electrodes is large. and lung damage
The splash is large, and the chance of scalding caused by large particle splash is high

Method used

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  • Welding method of full penetration overhead plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Welding groove preparation:

[0032] The size of the plate is 12mm×150mm×300mm, and the V-shaped groove is prepared by machining or flame cutting, the groove angle is 60°±5°, and the blunt edge is 0.5mm-1.0mm.

[0033] 2. Grinding and cleaning of test pieces

[0034] Use an angle grinder to remove oil stains, rust, water stains and other sundries within the range of 20mm-30mm on both sides of the groove surface and groove edge of the test piece, showing a metallic luster.

[0035] 3. Test piece assembly and tack welding

[0036]Assemble the polished test piece into a V-groove butt joint, the amount of misalignment is not more than 5% of the plate thickness, that is: ≤0.6mm, the assembly gap is 1.5mm-2.0mm at the beginning welding end, and the final welding end clearance is 2.0mm mm-2.4mm. After the test piece is assembled, the tack welds are welded at both ends of the test piece. The length of the tack welds is 10-15mm, and it is required to be firm. The test piec...

Embodiment 2

[0046] 1. Welding groove preparation:

[0047] The size of the plate is 12mm×150mm×300mm, and the V-shaped groove is prepared by machining or flame cutting, the groove angle is 60°±5°, and the blunt edge is 1.0mm-1.5mm.

[0048] 2. Grinding and cleaning of test pieces

[0049] Use an angle grinder to remove oil stains, rust, water stains and other sundries within the range of 20mm-30mm on both sides of the groove surface and groove edge of the test piece, showing a metallic luster.

[0050] 3. Test piece assembly and tack welding

[0051] Assemble the polished test piece into a V-groove butt joint, the misalignment amount is not more than 5% of the plate thickness, that is: ≤0.6mm, the assembly gap is 2.0mm-2.4mm at the beginning welding end, and the final welding end The gap is 2.4mm-3.5mm. After the test piece is assembled, the tack welds are welded at both ends of the test piece. The length of the tack welds is 10-15mm, and it is required to be firm. The test piece is re...

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Abstract

The invention discloses a welding method of a full penetration overhead plate. The welding method comprises the steps of welding groove preparing; welding part pretreatment, wherein the grooves and edges of the two sides of a welding part are cleared with the range of 20 mm-30 mm to show the metal luster, and the treated welding part is assembled into a butt joint of a V-shaped groove; base coat welding, wherein a small-amplitude oblique sawtoothed bar transporting method is adopted for achieving welding forwards in the welding direction; filling layer welding, wherein a reverse crescent bar transporting method is adopted for achieving welding forwards in the welding direction; and capping layer welding, wherein a crescent bar transporting method is adopted for achieving welding forwards in the welding direction. By means of the welding method of the full penetration overhead plate, CO2 gas shield welding is selected, small currents, short arc operation and other measures are adopted for reducing the sizes of molten drops so as to overcome the influence of molten drop gravity; meanwhile, under the combined action of surface tension and electromagnet contraction force, welding seamforming is promoted; and the single-face welding and double-face forming requirement of the butt-joint welding seam of the full penetration overhead plate is effectively met, and the percent of pass of primary flaw detection of the welding seam is improved to 95% or above.

Description

technical field [0001] The present application relates to the technical field of iron and steel material welding, in particular to a welding method of a full-penetration top plate. Background technique [0002] In prior art, CO 2 Gas shielded welding has been widely used in the welding production of steel structural parts because of its advantages of low welding cost, high production efficiency, and easy operation. Currently, CO 2 Gas shielded welding is mainly suitable for butt joints and fillet joints in horizontal and transverse positions. The key requirement for full penetration butt welds lies in the technology of single-side welding and double-side forming. During supine welding, due to the upside-down welding molten pool, there is no support of solid metal, which makes it difficult to form the weld. If the plate assembly gap, welding torch angle, welding current, arc length, and strip transportation method are not properly controlled, CO 2 When the gas shielded we...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/02B23K9/025B23K9/235B23K9/16
CPCB23K9/02B23K9/025B23K9/16B23K9/235
Inventor 田猛韩丽梅李丽曲锦波
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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