Thick plate submerged arc welding technology for low-temperature maritime engineering

A welding process and submerged arc welding technology, which is applied in the field of submerged arc welding of thick plates for low-temperature marine engineering, can solve the problems of increased labor intensity, long research and development cycle, and high cost, and achieve excellent overall joint performance and good impact toughness reserve. and the effect of safety and wealth

Active Publication Date: 2012-02-29
NANJING IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The method of developing new steel types requires a solid theoretical foundation, and a large number of experiments are carried out on this basis to realize it. The cost is high and the research and development cycle is long; the use of special processing methods requires special processing equipment and requires secondary processing. This labor increases the labor intensity and increases the production cost at the same time

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  • Thick plate submerged arc welding technology for low-temperature maritime engineering
  • Thick plate submerged arc welding technology for low-temperature maritime engineering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A kind of submerged arc welding process of F550 submerged arc welding of thick plate for low temperature marine engineering, the process comprises the following steps:

[0021] Thick plate F550 for low temperature marine engineering, its chemical composition and weight percentage are: C: 0.08%, Si: 0.28%, Mn: 1.53%, P: 0.006%, S: 0.001%, Als: 0.006%, Nb: 0.024 %, Ti: 0.010%, Zr: 0.006%, Cr+Mo+Ni+Cu=2.0%, steel carbon equivalent Ceq=0.55%, and the balance is Fe and trace impurities. Its thickness is 60mm.

[0022] The welding material is Spoolarc ENi4, its composition is: 0.165%C, 0.84%Mn, 0.19%Si, 0.003%S, 0.009%P, 0.009%Cu, 0.1%Cr, 0.15%Mo, 1.73%Ni, 0.004Al, flux Grade OK FLUX 10.62. Wire diameter: 4mm.

[0023] Using submerged arc welding method. The groove adopts a symmetrical double-sided X-shaped groove, the groove angle is 50-60°, and the groove gap is 2-5mm. When the ambient temperature is not lower than 10°C, the F550 low-temperature marine thick plate shoul...

Embodiment 2

[0026] Another F550 submerged arc welding process for thick plates used in low-temperature marine engineering, the process includes the following steps:

[0027] Thick plate F550 for low temperature marine engineering, its chemical composition and weight percentage are: C: 0.08%, Si: 0.28%, Mn: 1.53%, P: 0.006%, S: 0.001%, Als: 0.006%, Nb: 0.024 %, Ti: 0.010%, Zr: 0.006%, Cr+Mo+Ni+Cu=2.0%, steel carbon equivalent Ceq=0.55%, and the balance is Fe and trace impurities. Its thickness is 60mm.

[0028] The welding material is Spoolarc ENi4, its composition is: 0.165%C, 0.84%Mn, 0.19%Si, 0.003%S, 0.009%P, 0.009%Cu, 0.1%Cr, 0.15%Mo, 1.73%Ni, 0.004Al, flux Grade OK FLUX 10.62. Wire diameter: 4mm.

[0029] Using submerged arc welding method. The groove adopts a symmetrical double-sided X-shaped groove, the groove angle is 50-60°, and the groove gap is 2-5mm. When the ambient temperature is not lower than 10°C, the F550 low-temperature marine thick plate should be preheated at 100°...

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Abstract

The invention discloses a thick plate submerged arc welding technology for low-temperature maritime engineering, which comprises the steps of: adopting a thick plate F550 which meets chemical compositions and weight percentage as well as classification society rules, wherein the steel carbon equivalent Ceq is less than or equal to 0.60%; selecting solder wires which meet chemical compositions andweight percentage; adopting a symmetrical double-faced X-shaped groove as a submerged arc welding groove, wherein the groove angle is 50-60 degrees, and the groove gap is 2-5mm; when the thickness ofa steel plate is less than or equal to 60mm, and the temperature is not lower than 10 DEG C, preheating to 100 DEG C for welding; and selecting the welding parameter, wherein the weld heat input quantity is less than or equal to 50kJ/cm. When the multilayer and multi-channel continuous welding technology is adopted by the invention, a welding joint is excellent in comprehensive mechanical property, and a welding line and a welding heat affected zone are good in impact toughness.

Description

technical field [0001] The invention relates to a welding process for low-alloy high-strength steel, in particular to a submerged arc welding process for thick plates used in low-temperature marine engineering. Background technique [0002] In recent years, with the rapid development of the national economy, the construction of offshore platforms has become increasingly large-scale. The large-scale development of equipment requires that the steel materials used in construction should not only have thicker specifications, but also have higher strength and better low-temperature impact toughness, which brings a series of problems to the welding of materials. One of the problems is that after welding, the impact toughness of the welding heat-affected zone of the thick plate is seriously reduced. To some extent, welding technology has become one of the key technologies in offshore platform construction. [0003] The reduction of toughness in the heat-affected zone of large-sca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/18B23K9/23B23K9/235
Inventor 朱爱玲王红鸿吴开明许俊贻
Owner NANJING IRON & STEEL CO LTD
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