Welding wire for ultralow-temperature steel

Abstract

The invention relates to a welding wire for an ultralow-temperature steel. The welding wire, comprises, by weight, no more than 0.06% of C, 0.1%-1.0% of Si, 9%-16% of Mn, 14%-20% of Ni, 10%-14% of Cr,3%-6% of Mo, no more than 0.2% of N, 0.005%-0.20% of Ti, and the balance Fe and impurity elements. The welding wire can be used for welding superconductive fusion-cooled components.

Description

technical field [0001] The invention relates to a welding wire, which belongs to the technical field of welding materials, in particular to a welding wire for ultra-low temperature steel welding. Background technique [0002] Superconductors and other ultra-low temperature operating mechanisms usually require media such as liquid helium or absolute zero water for cooling protection. The temperature of liquid helium is about 4-14K, and the cooling mechanism is often constructed with ultra-low temperature steel. [0003] Low-temperature austenitic stainless steel and nickel-based alloys have good low-temperature toughness, so they are candidate materials. However, due to the high price of nickel-based alloys, low-temperature austenitic stainless steels are usually selected. [0004] Since the entire component system needs to have the same low temperature performance, the same is true for the welded part, which poses challenges to welding materials and processes. Since the m...

AI Technical Summary

Problems solved by technology

[0005] Narrow gap welding has high efficiency due to the small groove angle and small welding deposition amount; however, due to the large welding constraints, thermal cracks are prone to occur, which affects the welding quality

Patent 5469648 provides a technique to reduce the susceptibility to hot cracking by adding rare earth elements, but at the same time, rare earths reduce the stability of the welding arc, resulting in weld spatter, which is a serious problem for narrow gap welding , because the gap is small and cannot be cleaned; if not cleaned, it will affect the quality of the subsequent weld bead, such as incomplete fusion, slag inclusion, etc.

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