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Dissimilar steel welding method

A welding method and dissimilar steel technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve problems such as thermal cracks and embrittlement of welded joints, and achieve the goal of reducing brittleness, improving plasticity and toughness, and increasing content Effect

Inactive Publication Date: 2017-12-22
CHINA NUCLEAR IND 23 CONSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problems of embrittlement and thermal cracking of welded joints when welding X1NiCrMoCu25-20-5 and X2CrNiMoCuN25-6-3, the present invention proposes a method for X1NiCrMoCu25-20-5 and X2CrNiMoCuN25-6-3 dissimilar Welding method for welding steel

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0032] Example 1, a section of X1NiCrMoCu25-20-5 steel plate base material with a thickness of 2.6mm and a section of X2CrNiMoCuN25-6-3 steel plate base material with a thickness of 2.6mm are selected. First, the welding parts of the two sections of X1NiCrMoCu25-20-5 and X2CrNiMoCuN25-6-3 dissimilar steel base materials to be welded are processed into a 37.5° V-shaped groove, and the surface of the groove and the grooves within 20mm around the groove The inner and outer surfaces of the base metal are cleaned, including cleaning of impurities and oil and grinding the surface of the base metal until metallic luster appears. Next, group the X1NiCrMoCu25-20-5 and X2CrNiMoCuN25-6-3 dissimilar steel base materials that have completed the groove processing, and control the gap between the groups between 1 and 4mm. Then, according to the welding parameters in Table 1, the ER309L welding wire with a diameter of φ1.6mm was selected, and the X1NiCrMoCu25-20-5 and X2CrNiMoCuN25-6-3 dissim...

Embodiment 2

[0035]Embodiment 2, adopt the welding method identical with embodiment 1 to carry out welding operation to X1NiCrMoCu25-20-5 and X2CrNiMoCuN25-6-3 dissimilar steel base material, and its difference is: embodiment 2 adopts the welding parameter in table 3 to X1NiCrMoCu25- 20-5 and X2CrNiMoCuN25-6-3 dissimilar steel base metals are welded; at the same time, the interlayer temperature is controlled to 170 °C. Finally, the welding product X2 is obtained.

[0036] table 3

[0037]

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Abstract

The invention belongs to the technical field of dissimilar steel welding, and particularly relates to a welding method for X1NiCrMoCu25-20-5 and X2CrNiMoCuN25-6-3 dissimilar steel plates or tubes with thicknesses or wall thicknesses smaller than 5 mm. In order to solve the problems that embrittlement and heat cracks of a welding joint easily appear during welding of X1NiCrMoCu25-20-5 and X2CrNiMoCuN25-6-3, the invention discloses a welding method for welding X1NiCrMoCu25-20-5 and X2CrNiMoCuN25-6-3 dissimilar steel. The method comprises the following steps: step S1, performing groove processing and welding assembly on to-be-welded X1NiCrMoCu25-20-5 and X2CrNiMoCuN25-6-3 dissimilar steel base materials; and step 2, performing welding operation on the to-be-welded X1NiCrMoCu25-20-5 and X2CrNiMoCuN25-6-3 dissimilar steel base materials, wherein the welding parameter comprises a welding current value of 35-80 A. Parameters in a welding operation process are selected and controlled, so that welding on X1NiCrMoCu25-20-5 and X2CrNiMoCuN25-6-3 dissimilar steel is realized; and moreover, the welding joint with excellent welding performances is obtained.

Description

technical field [0001] The invention belongs to the technical field of dissimilar steel welding, and in particular relates to a welding method for X1NiCrMoCu25-20-5 and X2CrNiMoCuN25-6-3 dissimilar steel plates or pipes with thickness or wall thickness below 5mm. Background technique [0002] X1NiCrMoCu25-20-5 belongs to super austenitic stainless steel. This steel has no ferrite and has good oxidation resistance and corrosion resistance, but its heat sensitivity is low, and welding hot cracks are more likely to occur during welding. X2CrNiMoCuN25-6-3 is an austenitic-ferritic dual-phase steel, which has excellent pitting resistance, ductility and impact strength in seawater and other chloride-containing environments. [0003] Due to the difference in structure between X1NiCrMoCu25-20-5 and X2CrNiMoCuN25-6-3, when welding X1NiCrMoCu25-20-5 and X2CrNiMoCuN25-6-3 dissimilar steels, super austenite and austenite - When ferritic steel is welded, it is prone to embrittlement of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/167B23K9/23
CPCB23K9/167B23K9/232
Inventor 刘晓多陈广王宝迪
Owner CHINA NUCLEAR IND 23 CONSTR
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