Tungsten inert gas welding method of austenitic heat-resistant steel

A technology of austenitic heat-resistant steel and tungsten argon arc welding, which is applied in welding equipment, arc welding equipment, manufacturing tools, etc. The process is not clear and other problems, to achieve the effect of improving the welding work efficiency, inhibiting the occurrence of hot cracks, and strictly and reasonably controlling the parameters

Inactive Publication Date: 2018-11-13
TIANJIN UNIV
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Problems solved by technology

However, the relevant welding process for the base metal (22Cr25NiWCoCu) and the welding material has not been clarified
Improper selection of welding process can easily lead to problems such as embrittlement, thermal cracks and substandard mechanical properties of welded joints, which will seriously affect the safety and reliability of ultra-supercritical units. catastrophic accident

Method used

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  • Tungsten inert gas welding method of austenitic heat-resistant steel
  • Tungsten inert gas welding method of austenitic heat-resistant steel
  • Tungsten inert gas welding method of austenitic heat-resistant steel

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Embodiment Construction

[0024] Embodiments of the invention are described in detail below, but the invention can be practiced in many different ways as defined and covered by the claims. The present invention is described in detail below through specific examples. The present invention comprises the following steps:

[0025] Step 1, base metal material selection: 22Cr25NiWCoCu (UNSS31035) seamless steel pipe is selected as the austenitic heat-resistant steel, the outer diameter of the pipe is φ53.8mm, and the wall thickness is 8.9mm. The pipe specification is not limited to this. Selection of welding consumables: use domestically-made argon tungsten arc welding solid wire with a diameter of Φ2.4mm, and the diameter of the wire is not limited to this.

[0026] The welding wire is a product of Kunshan Jingqun Welding Material Technology Co., Ltd., the application number is 2017114261509, and the application date is December 25, 2017. The welding wire is an electric welding rod, which is composed of a ...

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Abstract

The invention discloses a tungsten inert gas welding method of austenitic heat-resistant steel. According to the tungsten inert gas welding method, for the austenite heat-resistant steel, a 22Cr25NiWCoCu (UNSS31035) seamless steel tube is selected is welded, a welding joint adopts a single-side 30-degree V-shaped groove, and cleaning is carried out; firstly, positions are fixed by using spot welding of tungsten-electrode argon arc welding before welding is carried out, and combined pairing is carried out; and then single-side welding and double-face forming are carried out by using tungsten-electrode argon arc welding, preheating is not carried out before welding, no heat treatment is carried out after welding, and meanwhile full-argon protection is adopted. According to the austenite ic heat-resistant steel pipeline welding process, welding stress and deformation are reduced, the brittleness of the welded joint can be reduced, the occurrence of thermal cracks is inhibited, the improvement of the plasticity and the toughness of the welded joint is realized, and then that the mechanical property of the pipeline after welding is comprehensively improved.

Description

technical field [0001] The present invention relates to the field of welding technology, more specifically, to a tungsten argon arc welding process for welding new austenitic heat-resistant steels with matching welding wires, in particular to a new austenitic heat-resistant welding process using matching welding wires Gas tungsten arc welding process for steel. Background technique [0002] Vigorously developing high-parameter, large-capacity ultra-supercritical units is an important way to improve the overall power generation efficiency of thermal power plants and prevent smog. The main steam pressure of the advanced ultra-supercritical thermal power unit breaks through 30MPa, the temperature of the reheated steam rises to 623°C, and the double reheating technology is adopted, and its operating efficiency can be increased to more than 50% (the operating efficiency of the current boiler is 35% to 45% %). After the power plant boiler is operated at a higher temperature and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/167B23K9/235
CPCB23K9/0052B23K9/167B23K9/235
Inventor 徐连勇张宇荆洪阳韩永典赵雷王登峰
Owner TIANJIN UNIV
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