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Mixed gas shielded welding process for ensuring strength of precipitation strength high-strength steel joint

A technology of mixed gas and joint strength, applied in welding equipment, manufacturing tools, arc welding equipment, etc., to achieve the effects of high welding efficiency, controllable hardness, and low incidence of welding defects

Inactive Publication Date: 2012-09-12
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Reduced strength loss after welding of precipitation-strengthened high-strength steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Thin slab continuous casting and rolling precipitation-strengthened high-strength steel, containing 0.13% Ti and 0.056% Nb by mass, coiling temperature 600°C, steel plate thickness 6mm, mechanical properties of hot-rolled state: yield strength 650MPa, tensile strength 710MPa, -20 ℃ impact absorption energy 52J, sample size 5mm×10mm×55mm.

[0024] 1. Adopt volume percentage 80%Ar+20%CO 2 The mixed gas shielded welding process is used for welding, ER100S-G mixed welding wire, the welding groove angle is 60 degrees, the groove gap is 1.5mm., and the oil and rust in the groove are cleaned before welding.

[0025] 2. Use single-side welding and double-side forming technology for backing welding, welding current is 90A, and welding line energy is 8kJ / cm.

[0026] 3. The second welding current is 160A, and the welding line energy is 18kJ / cm to ensure the penetration of the root of the weld and avoid welding defects.

[0027] 4. The welding current of the filler bead and capp...

Embodiment 2

[0031] Thin slab continuous casting and rolling precipitation-strengthened high-strength steel, containing 0.09% Ti and 0.078% Nb by mass, coiling temperature 580°C, steel plate thickness 10mm, mechanical properties of hot-rolled state: yield strength 780MPa, tensile strength 840MPa, -20 ℃ impact absorption energy 65J, sample size 7.5mm×10mm×55mm.

[0032] 1. Adopt volume percentage 80%Ar+20%CO 2 The mixed gas shielded welding process is used for welding, ER110S-G mixed welding wire, the welding groove angle is 60 degrees, the groove gap is 2mm., and the oil and rust in the groove are cleaned before welding.

[0033] 2. Use single-side welding and double-side forming technology for backing welding, welding current is 120A, and welding line energy is 10kJ / cm.

[0034] 3. The second welding current is 230A, and the welding line energy is 15kJ / cm to ensure the penetration of the root of the weld and avoid welding defects.

[0035] 4. The welding current of the filler bead and c...

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Abstract

The invention discloses a mixed gas shielded welding process for ensuring the strength of a precipitation strength high-strength steel joint, which belongs to the technical field of high-strength steel welding. In the process, precipitation strength high-strength steel of which the tensile strength is over 600MPa is welded by adopting technologies such as mixed gas shielded welding, single-sided welding double-sided shaping and the like. The mixed gas shielded welding process has the advantages that: the widths of a welding heat influencing region and a softening region can be reduced, the hardness of the heat influencing region is ensured, the loss of welding joint strength is lowered, the joint strength loss is controlled within 40MPa, and using requirements are met.

Description

technical field [0001] The invention belongs to the technical field of high-strength steel welding, and in particular relates to a mixed gas shielded welding process for ensuring the strength of precipitation-strengthened high-strength steel joints. Background technique [0002] Hot-rolled high-strength steel plates with a tensile strength higher than 600MPa have been widely used in construction machinery, bridges, automobiles, construction and other fields. Micro-alloyed high-strength steel occupies a dominant position in the market due to its low alloy cost and short production process. [0003] Thin slab continuous casting and rolling is a short-process process for producing hot-rolled coils successfully developed at the end of the 20th century. It has developed rapidly in my country in recent years. Studies have shown that compared with low-carbon steel of the same composition produced by traditional processes, thin slab continuous casting and rolling products have the ...

Claims

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Application Information

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IPC IPC(8): B23K9/16
Inventor 董现春张楠章军张熹潘辉陈延清牟淑坤张飞虎刘宏齐健许静郭占山
Owner SHOUGANG CORPORATION
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