Submerged arc mixed single-side welding method for 5Ni steel for B-type liquid cargo tank

By applying ceramic liner to the V-shaped bevel back of the 5Ni steel plate of the B-type cargo tank, and using a mixed welding method of CO2 gas-protective welding and submerged arc welding, the problems of numerous welding processes and low efficiency in the prior art are solved, single-sided welding double-sided forming is achieved, and welding quality and efficiency are improved.

CN119820034APending Publication Date: 2025-04-15JIANGNAN SHIPYARD (GRP) CO LTD
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Patent Information

Application Number
CN202510073513.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-17
Publication Date
2025-04-15

AI Technical Summary

Technical Problem

In the prior art, there are many welding construction processes for Type B liquid cargo tank 5Ni steel plates, which cannot achieve the effect of single-sided welding and double-sided forming, and the welding efficiency is low.

Method used

The single-sided welding method for 5Ni steel submerged arc mixed single-sided welding is adopted for B-type liquid cargo tanks. By pasting ceramic liners on the back of the V-shaped bevel, and combining CO2 gas-containing welding and submerged arc welding technology, single-sided welding double-sided forming is achieved.

Benefits of technology

It significantly reduces welding processes, improves welding efficiency, reduces safety risks, and improves the density and mechanical properties of the welds.

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Abstract

The invention provides a submerged arc mixed single-side welding method for 5Ni steel for a B-type liquid cargo tank. The submerged arc mixed single-side welding method comprises the steps that a V-shaped groove is machined in the welding position of two to-be-welded 5Ni steel plates; mounting and assembling a horse plate on the reverse side of the V-shaped groove; the welding area is cleaned; a ceramic liner is attached to the reverse side of the V-shaped groove, the center datum line of the ceramic liner is located in the center of the V-shaped groove, and an assembling horse plate area is fixed through a welding auxiliary tool; a CO2 gas shielded welding machine and a CO2 flux-cored wire are adopted for welding a bottoming layer weld bead on the front face of the V-shaped groove; and after the welding of the welding bead of the base layer is completed, an alternating current submerged arc welding machine and a submerged arc welding wire are adopted for continuously carrying out filling and multi-layer and multi-pass welding on the front face of the V-shaped groove. CO2 gas shielded welding is adopted for welding a priming layer, so that most welding work such as molten pool control, filling and capping still adopts submerged-arc welding, and the welding efficiency is remarkably improved; meanwhile, by means of the auxiliary effect of the reverse ceramic liner, reverse forming of the weld joint is achieved, and turning-over welding work of the 5Ni steel plate is reduced.
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Citation Information

Patent Citations

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