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Double-wire submerged arc welding method for high heat input energy welding of high-strength super-thick steel plates

A technology of large heat input welding and extra-thick steel plates, which is applied in the direction of welding/welding/cutting items, welding media, welding equipment, etc., to achieve the effect of simple method, excellent quality and improved welding efficiency

Inactive Publication Date: 2018-12-18
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is also not suitable for the welding of steel plates for high heat input welding

Method used

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  • Double-wire submerged arc welding method for high heat input energy welding of high-strength super-thick steel plates
  • Double-wire submerged arc welding method for high heat input energy welding of high-strength super-thick steel plates
  • Double-wire submerged arc welding method for high heat input energy welding of high-strength super-thick steel plates

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Experimental program
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Effect test

Embodiment 1

[0030] A double-wire submerged arc welding method for high-strength extra-thick steel plates for high-energy-input welding, comprising the following steps:

[0031] 1) The substrate is made of 60mm thick Q420 with yield strength R eh =475MPa, tensile strength R m =605MPa, the elongation rate is 25%, the average impact energy at -40°C is 253J, and the size of the welding test plate is 600mm×380mm×60mm.

[0032] 2) see figure 1 , the groove type is asymmetrical X type, the groove angle of the first welding surface 2 is 71°, the penetration depth of the first welding surface 2 is 17mm; the groove angle of the rear welding surface 1 is 60°, and the penetration depth of the rear welding surface 1 is 40mm; blunt The side is 3mm, and the assembly clearance is reserved for 3mm.

[0033] 3) Selected Submerged arc welding wire suitable for large heat input welding, the chemical composition of the submerged arc welding wire is by weight percentage: C: 0.063%, Si: 0.07%, Mn: 1.52%, N...

Embodiment 2

[0036] A double-wire submerged arc welding method for high-strength extra-thick steel plates for high-energy-input welding, comprising the following steps:

[0037] 1) The substrate adopts 100mm thick EH40 ship plate with yield strength R eh =427MPa, tensile strength 541MPa, elongation 24%, and average impact energy at -40°C is 313J. The size of the welding test plate is 600mm×380mm×100mm.

[0038] 2) see figure 1 The groove type is asymmetrical X type; the groove angle of the first welding surface 2 is 73°, and the penetration depth of the first welding surface 2 is 28mm; the groove angle of the rear welding surface 1 is 58°, and the penetration depth of the rear welding surface 1 is 68mm; blunt edge 4mm, reserve 4mm for assembly clearance.

[0039] 3) Selected The chemical composition of submerged arc welding wire suitable for large heat input welding (by weight%): C: 0.083%, Si: 0.02%, Mn: 1.47%, Ni: 0.53%, Ti: 0.082%, B: 0.0090% , S: 0.0040%, P: 0.014%, the balance i...

Embodiment 3

[0042] A double-wire submerged arc welding method for high-strength extra-thick steel plates for high-energy-input welding, comprising the following steps:

[0043] 1) The substrate is made of 80mm thick EH36 ship plate, with a yield strength of 384MPa, a tensile strength of 496MPa, an elongation of 23.5%, and an average impact energy of -40°C of 331J. The size of the welding test plate is 600mm×380mm×80mm.

[0044] 2) see figure 1 The groove type is asymmetrical X type; the groove angle of the first welding surface 2 is 68°, and the penetration depth of the first welding surface 2 is 22mm; the groove angle of the rear welding surface 1 is 62°, and the penetration depth of the rear welding surface 1 is 53mm; blunt edge 5mm, reserve 4mm for assembly clearance.

[0045] 3) Selected The chemical composition of submerged arc welding wire suitable for large heat input welding (by weight%): C: 0.092%, Si: 0.05%, Mn: 1.74%, Ni: 0.28%, Ti: 0.058%, B: 0.0077% , S: 0.0048%, P: 0.01...

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Abstract

The invention relates to a double-wire submerged arc welding method for the high heat input energy welding of high-strength super-thick steel plates. Double-wire submerged arc welding is carried out on the steel plates of which the thickness is larger than 50mm without carrying out preheating before welding or carrying out heat treatment after welding. The total welding heat input energy of double-wire submerged arc welding is controlled at 100+ / -5kJ / cm, interlayer temperature is controlled between 100DEG C and 150DEG C, and the welding groove type belongs to a non-symmetrical X type. The double-wire submerged arc welding method has the advantages that the method is simple, easy to operate and efficient, saves energy and is particularly suitable for guiding the building construction of a large steel structure; and the quality of welding joints is excellent, the deformation degree of the welded plates is very small, welding defects are effectively avoided, welding deformation is controlled, the welding efficiency is increased, and the welding operation intensity is reduced.

Description

technical field [0001] The invention belongs to the field of iron and steel material welding, and in particular relates to a double-wire submerged arc welding method for high-strength extra-thick steel plates for large heat input welding. Background technique [0002] Welding technology is one of the key technologies in modern shipbuilding, and the quality of welding in hull construction is an important indicator for evaluating shipbuilding quality. Welding is the longest process in large building components, which not only affects the construction cost, but also directly determines the construction period. Therefore, in order to further improve welding production efficiency and reduce structural construction costs, the demand for high-strength and extra-thick steel plates suitable for large-energy-input welding continues to increase. According to the relevant regulations of IACS (International Association Classification of Societies), the welding input energy above 50kJ / cm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/18B23K9/235B23K35/30B23K101/18
CPCB23K9/188B23K9/235B23K35/3073
Inventor 王佳骥付魁军刘芳芳蒋健博及玉梅傅博韩严法胡奉雅魏勇张欣强
Owner ANGANG STEEL CO LTD
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