Dissimilar steel welding joint
A technology for welding joints and dissimilar steels, applied in welding equipment, auxiliary welding equipment, welding/cutting auxiliary equipment, etc., to reduce strain, improve oxidation resistance, and avoid oxidation gaps
Inactive Publication Date: 2021-04-02
THERMAL POWER TECH RES INST OF CHINA DATANG CORP SCI & TECH RES INST
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Additionally, if figure 2 As shown, due to the influence of the dissimilar steel joint structure, there is a large strain at the fusion line on the low alloy steel side
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[0015] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0016] Such as image 3 As shown, a dissimilar steel welded joint includes ferrite and austenite, and the groove angle of the weld between ferrite and austenite is 30°.
[0017] The groove angle of conventional dissimilar steel welded joints is about 45°. According to the finite element stress analysis, when the groove angle is 30°, the creep strain at the fusion line of the low-alloy steel base metal side of the dissimilar steel joints decreases, thereby redu...
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The invention belongs to the technical field of welding processes, and particularly relates to a dissimilar steel welding joint. The welding joint comprises ferrite and austenite; the groove angle ofa welding seam between the ferrite and the austenite is 30 degrees; and the inner wall and the outer wall of the welding seam portion of the ferrite and the austenite and the inner wall and the outerwall of the extending portion of the welding seam portion of the ferrite and the austenite are treated through an aluminizing process. According to the dissimilar steel welding joint, the strain of alow alloy steel base metal side fusion line part of the servicing welding joint is reduced, the oxidation resistance of the dissimilar steel welding joint is improved, and the oxidation effect and thestrain effect are weakened. Besides, the interaction of oxidation and strain is effectively separated, so that an oxidation notch is prevented from being formed in the low alloy steel side fusion line part of the dissimilar steel welded joint, the failure probability of the dissimilar steel welded joint can be greatly reduced, and early cracking of the dissimilar steel welded joint is effectivelyprevented.
Description
technical field [0001] The invention belongs to the technical field of welding technology, and in particular relates to a welded joint of dissimilar steels. Background technique [0002] In recent years, as power plant boilers have entered the era of supercritical and ultra-supercritical, there have been more and more welded joints of ferritic / austenitic dissimilar steel for high-temperature parts of boilers, and early failures of dissimilar steel joints below the design life have occurred many times at home and abroad. The accident caused the entire unit to be forced to shut down and caused huge economic losses. The early failure of dissimilar steel joints has problems such as long time span and difficulty in detection by conventional flaw detection methods, so it is difficult to formulate supervision countermeasures. Such as figure 1 As shown, through in-depth analysis and research on dissimilar steel joints with different operating parameters, different failure times, a...
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IPC IPC(8): B23K37/02B23K37/00
CPCB23K37/02B23K37/00
Inventor 谌康蔡文河陈鑫郭德瑞刘长福张坤董树青杜双明
Owner THERMAL POWER TECH RES INST OF CHINA DATANG CORP SCI & TECH RES INST