Application of laser in low activation martensitic steel welding and welding method

A technology of laser welding and welding methods, applied in laser welding equipment, welding/welding/cutting items, welding equipment, etc., can solve the problems of reduced weld toughness, irradiation embrittlement, harshness, etc., and achieves less welding stress and deformation. , Improve the overall performance, the effect of fast welding speed

Inactive Publication Date: 2009-10-21
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

RAFM steel has relatively strict requirements on welding, and changes in annealing and tempering temperature and time will cause large changes in the properties of the weld. During the welding process of the material, the performance, structure and chemical composition of each part of the welded joint area will change greatly. , Welds are prone to welding defects such as reduced weld toughness, aging tendency, heat-affected zone (HAZ) softening, cold cracks, and type IV cracks. After irradiation, radiation embrittlement, bubbles, and swelling may occur. At the same time, welding will also have a greater impact on the corrosion performance of the material.
However, there are few studies on the welding of CLAM steel, and there are only preliminary studies on hot isostatic pressure diffusion welding [Report
Fusion welding is considered to be the key technology for obtaining good quality of cladding components. So far, there has been no research report on laser welding of CLAM steel. Therefore, using new welding technology to obtain reliable welded joints has become a crucial research topic

Method used

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  • Application of laser in low activation martensitic steel welding and welding method
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  • Application of laser in low activation martensitic steel welding and welding method

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Embodiment 1

[0021] Embodiment 1 of the present invention: laser welding of CLAM steel: the CLAM steel plate is cut into 80mm × 12mm samples, and the welding joints of the samples are polished with metallographic sandpaper before welding, and cleaned with acetone, and then Nd:YAG is used The laser is used for welding, the defocus is 0mm, the welding thickness is 6mm under the conditions of laser output power P=4KW, welding speed V=9mm / s, spot diameter d=0.5mm, protective gas Argon: 30L / min. After cross-section and microstructure analysis, the results show that the welded joint has no welding defects, no inclusions, no pores, and good fusion. The cross-sectional photos and microstructure pictures of the welded joint are as follows figure 1 and figure 2 Shown; Tensile test was carried out on the welded sample, the sample was broken at the base metal, but not at the weld and heat-affected zone, and the weld performance was good, as shown in image 3 shown.

Embodiment 2

[0022] Embodiment 2 of the present invention: laser welding of CLAM steel: the CLAM steel sheet is cut into 80mm × 12mm samples, and the welding joints of the samples are polished with metallographic sandpaper before welding, and cleaned with acetone, and then Nd:YAG is used Laser welding, defocus amount 0mm, under the conditions of laser output power P=3.5KW, welding speed V=25mm / s, spot diameter d=0.5mm, shielding gas Argon: 30L / min, welding thickness 5mm. After cross-section and microstructure analysis, the results show that the welded joint has no welding defects, no inclusions, no pores, and good fusion. The cross-sectional photos and microstructure pictures of the welded joint are as follows Figure 4 and Figure 5 Shown; Tensile test was carried out on the welded sample, the sample was broken at the base metal, but not at the weld and heat-affected zone, and the weld performance was good, as shown in Figure 6 shown.

Embodiment 3

[0023] Embodiment 3 of the present invention: laser welding of CLAM steel: the CLAM steel sheet is cut into 80mm × 12mm samples, and the welding joints of the samples are polished with metallographic sandpaper before welding, and cleaned with acetone, and then Nd:YAG is used The laser is used for welding, the defocus amount is 0mm, and the welding thickness is 5mm under the conditions of laser output power P=4KW, welding speed V=15mm / s, spot diameter d=0.5mm, shielding gas Argon: 30L / min. The results of microstructure analysis show that the welded joint has no welding defects, no inclusions, no pores, and good fusion.

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Abstract

The invention relates to the technical field of welding, disclosing an application of laser welding in low activation martensitic (CLAM) steel welding and a welding method. Linear cutting is carried out on CLAM steel, welding joint is polished by metallographical sand paper before welding and is washed by acetone, and then laser welding is carried out by an Nd: YAG laser. Compared with the prior art, the invention first adopts laser to weld CLAM steel; the welding is penetration welding, the welding thickness is 4-6mm, and the welding effect is excellent. The welding joint after being welded is neat and aesthetic with no crack and cavity generated macroscopically, microstructure analysis shows that the welding joint has no welding defect, no inclusion and no pore-free being with excellent fusion, thereby greatly improving the comprehensive property of the welding joint of CLAM steel.

Description

Technical field: [0001] The invention relates to the field of welding technology, in particular to the application and welding method of laser welding in the welding of low-activation martensitic steel in China. Background technique: [0002] Nuclear fusion energy is considered as a potential technology to meet the future energy needs of mankind. Low activation ferritic / martensitic steels (Reduced Activation Ferritic / Martensitic steels, RAFMs) have excellent thermophysical and mechanical properties such as low radiation swelling and thermal expansion coefficient, high thermal conductivity, and relatively mature Therefore, it is generally considered to be the preferred structural material for future fusion demonstration reactors and fusion power reactors. CLAM steel is a low-activation martensitic steel developed in China in recent years with completely independent intellectual property rights. Welding is one of the key technologies for its practical application. RAFM stee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/20B23K26/42B23K26/14B23K103/04B23K26/24B23K26/70
Inventor 雷玉成韩明娟王健
Owner JIANGSU UNIV
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