High-crack-resistance nickel base and stainless steel dissimilar welding joint and preparation method thereof

A welded joint, high crack resistance technology, applied in the direction of welding equipment, welding medium, welding/cutting medium/material, etc., can solve the problems of high tendency of thermal cracks, hidden dangers of structural safety, and difficulty in ensuring the quality of welded joints, etc.

Inactive Publication Date: 2018-12-11
张家港创博金属科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In construction practice, when Ni30Cr is applied to the welding of stainless steel substrates, the tendency of thermal cracks is large, especially in the case of 304, 308 and other stainless steels, it is difficult to ensure the quality of welded joints, which brings hidden dangers to structural safety

Method used

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  • High-crack-resistance nickel base and stainless steel dissimilar welding joint and preparation method thereof
  • High-crack-resistance nickel base and stainless steel dissimilar welding joint and preparation method thereof
  • High-crack-resistance nickel base and stainless steel dissimilar welding joint and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0044] The 40mm thick steel plate is butted with a V-shaped groove.

[0045] Welding wire with a diameter of 1.2mm is selected, in terms of weight percentage, S and P≤0.003%, Mn 0.5-0.8%, Al≤0.12%, and Nb+Ta 0.6-0.9% in the welding wire.

[0046] The welding process is shown in Table 1, and the pulse peak current is 220-250A.

[0047] After welding, the quality inspection of dissimilar metal welded joints is carried out. The chemical composition of the weld metal is shown in Table 2, and the crack resistance performance is shown in Table 3.

Embodiment 5-6

[0049] The butt joint of steel pipes with a wall thickness of 16mm and a diameter of 800mm adopts a U-shaped groove.

[0050] Welding wire with a diameter of 1.0mm is selected, in terms of weight percentage, S and P≤0.002%, Mn 0.6-0.8%, Al≤0.10%, and Nb+Ta 0.7-0.8% in the welding wire.

[0051] The welding process is shown in Table 1, and the pulse peak current is 220-240A.

[0052] After welding, the quality inspection of dissimilar metal welded joints is carried out. The chemical composition of the weld metal is shown in Table 2, and the crack resistance performance is shown in Table 3. Comparative example 1-2:

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Abstract

The invention relates to a high-crack-resistance nickel base and stainless steel dissimilar welding joint and a preparation method thereof. The high-crack-resistance nickel base and stainless steel dissimilar welding joint is prepared from the following welding seam metals in percentage by weight: less than 0.005% of S, less than or equal to 0.30% of Si, less than or equal to 0.01% of S+P, 28-34%of Cr, less than or equal to 0.03% of Mo+Cu, 0.5-1.5% of Nb+Ta, 0.4-1.0% of Mn and the balance of nickel. A pulse current welding way is adopted, average current is 120-150A, a welding parameter P islower than or equal to 0.15, P is equal to (I*V*T) / (D*F), I is welding current (A), V is power supply voltage (V), T is welding speed (mm / s), D is a welding wire diameter (mm), F is wire feeding speed(mm / s) and a dilution rate is lower than 35%. The method can be used for dissimilar metal welding of stainless steel in a nuclear reactor.

Description

technical field [0001] The invention relates to a method for preparing a highly crack-resistant dissimilar metal welded joint, belonging to the field of welding technology, in particular to the preparation of nickel-based and stainless steel dissimilar metal welded joints, which can effectively reduce thermal cracks and improve the service life and safety of nuclear reactor internal components. Background technique [0002] A large number of stainless steels and nickel-based alloys are used in the internal components of nuclear reactors, which involve many stainless steels and low-alloy steels, stainless steels and nickel-based alloys, and dissimilar welding between low-alloy steels and nickel-based alloys. In the welding of dissimilar metals, in order to avoid welding defects and cracks and improve weldability, transition layer metals and nickel-based alloy filling methods are usually used to improve the quality of welded joints. [0003] Nickel-based alloys 82 / 182 (Ni-18Cr...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): B23K35/30B23K35/40
CPCB23K35/304B23K35/40
Inventor朱俊李小宝潘鑫
Owner张家港创博金属科技有限公司