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High-strength steel stranded electrode and welding method thereof

A technology of stranded welding wire and high-strength steel, applied in welding medium, welding equipment, welding equipment and other directions, can solve the problems of strength and toughness matching and welding process performance that are difficult to meet the technical requirements of steel pipe welding for offshore drilling platforms, and achieve excellent technology. performance, reduced material waste, the effect of good welding manufacturability

Inactive Publication Date: 2019-12-31
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

Gas-shielded solid welding wire not only requires good strength and toughness matching, but also has excellent welding process performance. The existing gas-shielded welding wire has strong toughness matching and welding process performance. It is difficult to meet the welding technical requirements of steel pipes for offshore drilling platforms.

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  • High-strength steel stranded electrode and welding method thereof

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Effect test

Embodiment 1

[0031] A high-strength steel stranded welding wire, its components include: carbon 0.06%, silicon 0.8%, manganese 1.4%, nickel 0.9%, titanium 0.1%, chromium 0.18%, copper 0.02%, aluminum 0.05%, phosphorus <0.010%, sulfur <0.005%, and the balance is iron.

[0032] The welding method of above-mentioned high-strength steel stranded welding wire, comprises the steps:

[0033] S1. Use mechanical methods to process the welding groove, use argon gas for welding protection during cutting, and polish the groove processing surface smoothly; wherein the welding groove angle is 40°, and the horizontal welding position adopts a symmetrical groove;

[0034] S2. Use the single pulse welding mode to weld the bottom weld bead, the welding current is 125A, the wire feeding speed is 5m / min, the back weld width is 7mm, the penetration depth on both sides of the root is 3mm, and the surface of the weld bead is cleaned; then use double pulse In the welding mode, two welds are welded in sequence, t...

Embodiment 2

[0037] A high-strength steel stranded welding wire, its components include: carbon 0.12%, silicon 0.4%, manganese 2.0%, nickel 0.5%, titanium 0.16%, chromium 0.14%, copper 0.04%, aluminum 0.02%, phosphorus <0.010%, sulfur <0.005%, and the balance is iron.

[0038] The welding method of above-mentioned high-strength steel stranded welding wire, comprises the steps:

[0039] S1. Use mechanical methods to process the welding groove, use argon gas for welding protection during cutting, and polish the groove processing surface smoothly; wherein the welding groove angle is 45°, and the horizontal welding position adopts a symmetrical groove;

[0040] S2. Use the single pulse welding mode to weld the bottom weld bead, the welding current is 115A, the wire feeding speed is 5m / min, the back weld width is 8mm, the penetration depth on both sides of the root is 2mm, and the surface of the weld bead is cleaned; then use double pulse In the welding mode, two welds are welded in sequence, ...

Embodiment 3

[0043]A high-strength steel stranded welding wire, its components include: carbon 0.08%, silicon 0.7%, manganese 1.6%, nickel 0.8%, titanium 0.11%, chromium 0.17%, copper 0.025%, aluminum 0.04%, phosphorus <0.010%, sulfur <0.005%, and the balance is iron.

[0044] The welding method of above-mentioned high-strength steel stranded welding wire, comprises the steps:

[0045] S1. Use mechanical methods to process the welding groove, use argon gas for welding protection during cutting, and polish the groove processing surface smoothly; wherein the welding groove angle is 41°, and the horizontal welding position adopts a symmetrical groove;

[0046] S2. Use the single pulse welding mode to weld the bottom weld bead, the welding current is 117A, the wire feeding speed is 5m / min, the width of the back weld is 7.2mm, and the penetration depth on both sides of the root is 2.9mm, and the surface of the weld bead is cleaned; then use In the double pulse welding mode, two welds are welde...

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Abstract

The invention discloses a high-strength steel stranded electrode which comprises the following components in percentage by mass: 0.06-0.12% of carbon, 0.4-0.8% of silicon, 1.4-2.0% of manganese, 0.5-0.9% of nickel, 0.1-0.16% of titanium, 0.14-0.18% of chromium, 0.02-0.04% of copper, 0.02-0.05% of aluminum, less than 0.010% of phosphorus, less than 0.005% of sulfur and the rest of iron. The weldingmethod of the high-strength steel stranded electrode comprises the steps of processing a welding groove by a mechanical method, and polishing a groove processing surface to be smooth; welding a backing weld by a monopulse welding mode, and cleaning the weld surface; welding two welding lines in sequence by a double pulse welding mode; welding the first welding line of a cover pass by the monopulse welding mode; and welding the remaining welding lines in order by way of separation welding by the double pulse welding mode.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a high-strength steel stranded welding wire and a welding method thereof. Background technique [0002] The steel pipes used for offshore drilling platforms have high strength, large pipe diameters, thick pipe walls, and long distances, which greatly increase the labor intensity of on-site welding construction. Especially for pipeline construction under harsh weather conditions and geographical environment, the effective construction time is short. [0003] High-strength steel pipes have high requirements on the welding process performance of welding wire, the mechanical properties of the weld seam and the production process, especially the on-site girth welding is mainly completed by all-position automatic gas shielded welding. Toughness and good welding process performance. Gas-shielded solid welding wire not only requires good strength and toughness matching, but also has e...

Claims

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Application Information

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IPC IPC(8): B23K35/30B23K35/18B23K9/235B23K9/16
CPCB23K9/16B23K9/235B23K35/0283B23K35/3053
Inventor 梁裕冯昱刘平礼吴阳龙
Owner 河北联之捷焊业科技有限公司
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