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High-strength steel submerged-arc stranded wire and welding method thereof

A high-strength steel, welding method technology, applied in welding medium, welding equipment, welding equipment and other directions, can solve the problems of low temperature toughness fluctuation, decline, toughness decline of welds, etc., achieve small welding spatter, high strength, increase hardening The effect of resistance and impact toughness

Inactive Publication Date: 2019-12-27
河北联之捷焊业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Low-alloy high-strength steel is welded with conventional Mo-Ti-B welding wire. The low-temperature toughness of the weld after welding is good, but the toughness of the weld seam decreases significantly after tempering, which directly affects the quality and safety of these steel structures. The zone of influence is the weakest point, so improving weld toughness is critical to the safety of shipbuilding steel structures
[0003] Shipbuilding usually uses high-strength longitudinal submerged arc welded pipes for production. When using various submerged arc welding wires currently on the domestic market to weld steel pipes, the problem of low-temperature toughness fluctuations and obvious drops of welds after tempering often occurs, which needs to be solved urgently

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A high-strength steel submerged arc stranded welding wire, its components include: carbon 0.08%, manganese 0.8%, copper 0.05%, nickel 0.2%, zirconium 0.1%, silicon 0.18%, molybdenum 0.02%, titanium 0.02%. , boron 0.2%, phosphorus <0.01%, sulfur ≤0.005%, and the rest are iron and unavoidable impurities.

[0028] For the welding method of the above-mentioned high-strength steel submerged arc stranded welding wire, the submerged arc welding groove of the steel plate to be welded adopts a symmetrical double-sided X-shaped groove, the groove angle is 50°, and the groove gap is 5mm, and then the inner welding and the outer welding are carried out. Welding, the welding speed is 1m / min; then heated to 590 ℃, heat preservation, air cooling.

Embodiment 2

[0030] A high-strength steel submerged arc stranded welding wire, its components include: carbon 1.2%, manganese 0.4%, copper 0.1%, nickel 0.1%, zirconium 0.2%, silicon 0.11%, molybdenum 0.08%, titanium 0.01%. , boron 0.4%, phosphorus <0.01%, sulfur ≤0.005%, and the rest are iron and unavoidable impurities.

[0031]For the welding method of the above-mentioned high-strength steel submerged arc stranded welding wire, the submerged arc welding groove of the steel plate to be welded adopts a symmetrical double-sided X-shaped groove, the groove angle is 60°, and the groove gap is 2mm, and then the inner welding and the outer welding are carried out. Welding, the welding speed is 1.4m / min; then heated to 540 ° C, heat preservation, air cooling.

Embodiment 3

[0033] A high-strength steel submerged arc stranded welding wire, its components include: carbon 0.35%, manganese 0.7%, copper 0.06%, nickel 0.18%, zirconium 0.13%, silicon 0.16%, molybdenum 0.04%, titanium 0.018% , boron 0.25%, phosphorus <0.01%, sulfur ≤0.005%, and the rest are iron and unavoidable impurities.

[0034] For the welding method of the above-mentioned high-strength steel submerged arc stranded welding wire, the submerged arc welding groove of the steel plate to be welded adopts a symmetrical double-sided X-shaped groove, the groove angle is 52°, and the groove gap is 4.5mm, followed by inner welding and For outer welding, the welding speed is 1.1m / min; among them, during the inner welding process, the welding heat input is 58.91kJ / cm; during the outer welding process, the welding heat input is 56.73kJ / cm; , air cooled.

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Abstract

The invention discloses a high-strength steel submerged-arc stranded wire. The high-strength steel submerged-arc stranded wire comprises the following components of, by mass percentage, 0.08-1.2% of carbon, 0.4-0.8% of manganese, 0.05-0.1% of copper, 0.1-0.2% of nickel, 0.1-0.2% of zirconium, 0.11-0.18% of silicon, 0.02-0.08% of molybdenum, 0.01-0.02% of titanium, 0.2-0.4% of boron, less than 0.01% of phosphorus, not larger than 0.005% of sulfur and the balance iron and inevitable impurities. The invention discloses a welding method of the high-strength steel submerged-arc stranded wire. The welding method comprises the steps that a steel plate to be welded is pretreated, then the inner side welding and the outer side welding are carried out, and then heating, heat preservation and air cooling are carried out. A welding seam formed by welding has the beneficial effects of being good in low-temperature impact toughness, low in yield ratio, high in strength, attractive in forming and thelike; and moreover, the welding spatter is small, and the welding process performance is excellent.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a high-strength steel submerged arc stranded welding wire and a welding method thereof. Background technique [0002] With the rapid development of social economy, high-strength steel submerged arc welding wire has been widely used in shipbuilding and other fields. Among them, the steel structure made of low-alloy high-strength steel generally needs to adopt welding process to achieve the purpose of connection, and in order to eliminate the welding stress or meet the relevant process requirements, the welded steel structure needs high temperature tempering. Low-alloy high-strength steel is welded with conventional Mo-Ti-B welding wire. After welding, the low-temperature toughness of the weld is good, but the toughness of the weld is significantly reduced after tempering, which directly affects the quality and safety of these steel structures. The affected zone is the weakest pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K35/18B23K35/40B23K9/18
CPCB23K9/18B23K35/0283B23K35/3053B23K35/40
Inventor 梁裕刘平礼冯昱吴阳龙
Owner 河北联之捷焊业科技有限公司
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