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Welding method of novel high alloy austenitic heat-resistant stainless steel

A heat-resistant stainless steel, welding method technology, applied in welding equipment, welding accessories, welding/welding/cutting items, etc., can solve the problems of welding hot cracks and low mechanical properties of welded joints, achieve excellent molding, and ensure welding work efficiency , to avoid the effect of excessive heat input

Inactive Publication Date: 2020-09-29
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to solve the problems of welding thermal cracks and low mechanical properties of welded joints during MIG welding of 8mm plate thickness 310SMOD stainless steel Y-joints

Method used

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  • Welding method of novel high alloy austenitic heat-resistant stainless steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In the second pass, the current is 180A, the voltage is 18.0V, the welding speed is 0.22m / min, and the heat input is 0.707 KJ / mm;

[0032] According to the national standard GB / T2651-2008 "Welded Joint Tensile Test Method", the welded joint sample of the present invention is processed into a standard tensile test sample, and the tensile test is carried out. The yield strength is ≥ 306 Mpa, and the tensile strength is ≥ 561 Mpa.

Embodiment 2

[0034] For the second pass, the current is 180A, the voltage is 18.0V, the welding speed is 0.25m / min, and the heat input is 0.622 KJ / mm;

[0035] According to the national standard GB / T2651-2008 "Welded Joint Tensile Test Method", the welded joint sample of the present invention is processed into a standard tensile sample, and the tensile test is carried out. The yield strength is ≥ 324 Mpa, and the tensile strength is ≥ 583 Mpa.

Embodiment 3

[0037] In the second pass, the current is 180A, the voltage is 18.0V, the welding speed is 0.3m / min, and the heat input is 0.518KJ / mm;

[0038] According to the national standard GB / T2651-2008 "Welded Joint Tensile Test Method", the welded joint sample of the present invention is processed into a standard tensile sample, and the tensile test is carried out. The yield strength is ≥ 313 Mpa, and the tensile strength is ≥ 573 Mpa.

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Abstract

The invention provides a welding method of novel high alloy austenitic heat-resistant stainless steel, and belongs to the field of stainless steel welding. The welding method comprises the following steps of preheating a workpiece to 100 DEG C, welding the workpiece in two passes, keeping the interlayer temperature not higher than 100 DEG C, selecting the current to be 180A, the voltage to be 18.0V, and a protective gas to be a mixed gas with a volume ratio of Ar of 97.5% and CO2 of 2.5%; the flow rate of the protective gas is 12 to 18L / min; for the first pass, the current is 180A, the voltageis 18.0V, and the welding speed is 0.3m / min; the heat input is 0.518KJ / mm; for the second pass, the current is 180A, the voltage is 18.0V, and the welding speed is 0.2 to 0.4m / min; the heat input is0.30 to 0.71KJ / mm; and the coefficient of thermal efficiency is 0.8. According to the welding method of the novel high alloy austenitic heat-resistant stainless steel provided by the invention, a weldis excellent in shaping, the overall weld appearance is uniform, and there are no weld defects such as cracks, pores, undercuts and the like.

Description

technical field [0001] The invention belongs to the technical field of stainless steel welding, and in particular relates to a welding process of a novel high-alloy austenitic heat-resistant stainless steel. Background technique [0002] In order to greatly improve the performance of two types of large-scale broad-austenitic stainless steel, Taiyuan Iron and Steel (Group) Co., Ltd. has developed a new material of high-alloy austenitic heat-resistant stainless steel (Taiyuan Iron and Steel's internal number 310SMOD), which has been in service for a long time It has good high-temperature performance in the environment and can meet the major needs of high-end manufacturing industries such as coal chemical industry, energy, and petroleum refining. [0003] 310SMOD steel belongs to heat-resistant austenitic stainless steel. Welding hot cracks (crystal cracks) are prone to occur when welding this type of steel, especially when the thickness of the weldment is too large or the ambi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/173B23K9/133B23K9/28B23K9/32B23K103/04
CPCB23K9/133B23K9/173B23K9/287B23K9/32B23K2103/05
Inventor 刘洁范光伟王新张威刘春来李玉贵赵贺
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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