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Super-thick steel plate welding method

A welding method and technology for extra-thick steel plates, applied in welding equipment, welding accessories, welding/welding/cutting items, etc., to achieve the effects of simple method, reasonable improved design, and good technical benefits

Active Publication Date: 2015-03-04
NO 9 METALLURGICAL CONSTR
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  • Description
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Problems solved by technology

[0003] In view of the above situation, in order to overcome the defects of the prior art, the object of the present invention is to provide a welding method for extra-thick steel plates, which can effectively solve the problems of improving the weldability of extra-thick steel processes, improving construction efficiency and the first pass rate of weld flaw detection

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Embodiment Construction

[0033] The specific implementation manners of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0034] Depend on Figure 1-6 Provided, with the SM490BN steel plate welding embodiment with a thickness of 60-300mm, the welding method of the extra-thick steel plate of the present invention includes the following steps:

[0035] 1. Processing welding groove

[0036] Conduct 100% UT inspection on the edge of the weld of the two steel plates to be welded along the length of 2 times the thickness of the plate plus 30mm to prevent defects such as interlayer or looseness, and make a bevel sample by setting out, and use a planer to process the welding bevel , the welding groove is a double-sided asymmetric U-shaped welding groove, the positive and negative groove angles are both α=22~24°, the thickness of the blunt side of the welding groove is p=3~4mm, and the root of the front welding groove Radius R1=8~10mm, reverse wel...

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Abstract

The invention relates to a super-thick steel plate welding method. According to the method, the fabrication weldability of super-thick steel can be effectively improved, and the construction efficiency and the weld inspection first-pass yield can be improved. The method comprises the following steps of 1, processing a welding groove; 2, preparing before welding; 3, preheating before welding; 4, welding. The method is simple; the improved design of the welding groove is reasonable and reliable, and the method is suitable for common domestic single wire submerged arc welding machines and is high in practicability; a combined welding process of taking super low hydrogen electrode arc welding as backing weld and adopting submerged arc welding for filling and cosmetic welding is adopted, and the welding advantages of the two processes are integrated; the fabrication weldability of the super-thick steel plate is greatly improved, the welding quality of the super-thick steel plate is controlled, the first-pass yield of super-thick steel plate butt weld inspection is improved, and the method can be widely applied to welding construction of low-alloy high-strength structural steel super-thick steel plates which are 60-300mm in thickness and has good technical, economic and social benefits.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a method for welding extra-thick steel plates, especially a submerged arc welding method suitable for butt welds of extra-thick steel plates with a thickness of 60-300 mm. Background technique [0002] With the development of steel structure technology, extra-thick steel is more and more widely used in the field of steel structure construction, and extra-thick steel welding technology has become a key welding technology for steel structures. As the thickness of the steel plate increases, the weldability of extra-thick steel is poorer, the difficulty of welding is greater, and welding defects are more likely to occur in welding construction, especially weld cracks, root pores and interlayer slag inclusions, and the first pass rate of weld flaw detection is low , It is difficult to repair, and the construction efficiency of repair welding is low. Therefore, effectively improving ...

Claims

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Application Information

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IPC IPC(8): B23K9/18B23K9/02B23K9/235B23K9/013B23K9/32B23K101/18
CPCB23K9/013B23K9/025B23K9/18B23K9/235B23K9/32B23K33/00B23K33/004B23K2101/18B23K2103/04
Inventor 秋新任梁光意彭江沛成占平任晓妮
Owner NO 9 METALLURGICAL CONSTR
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