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Narrow-gap melting polar reactive gas shielded arc welding technology

An active gas, narrow gap technology, used in arc welding equipment, manufacturing tools, welding equipment, etc., can solve the problems of not well meeting the welding process, large structure size, large cold cracking tendency, etc., to reduce the welding filling amount , The effect of large cold cracking tendency and large groove filling amount

Active Publication Date: 2014-05-21
SHANGHAI ZHENHUA HEAVY IND
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Problems solved by technology

The main reason is that the material of the leg rack is Q690E steel, the maximum plate thickness can reach 178mm, the structural size is large, the weldability is poor, the tendency of cold cracking is large, the welding deformation requirements are strict, and the first pass rate is high. The existing welding technology cannot be very good. Well meet the requirements of the welding process

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Embodiment Construction

[0028] refer to figure 1 As shown, the present invention discloses a narrow gap melting electrode active gas shielded arc welding process, including:

[0029] 102. Preparation steps before welding. The pre-weld preparation steps include the groove processing process, the pretreatment process, the preheating process and the groove assembly process. In one embodiment, the angle of the groove obtained in the groove processing process is 0.5°-2°, the blunt edge at the root is 1-4 mm, and the pair gap is 16-20 mm. figure 2 Disclosed is a processed groove structure in a narrow gap metal active gas shielded arc welding process according to an embodiment of the present invention. exist figure 2 In the shown embodiment, the angle of the groove obtained during the groove processing process is 1°, the blunt edge of the root is 3mm, the pair gap is 18mm, the inclination angle of the root is 15°, and the plate thickness is 177.8mm. The pretreatment process includes removing rust and ...

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Abstract

The invention discloses a narrow-gap melting polar reactive gas shielded arc welding technology. The technology comprises a pre-welding preparation step, a positive multilevel narrow-gap vertical welding step, a mechanical back gouging step, a back multilevel narrow-gap vertical welding step, a both-side narrow-gap alternated vertical welding step and a postwelding retarded cooling step. Aiming at the characteristics of large racks of pile legs, thick walls, large bevel filler level, low welding efficiency and large cold cracking tendency, the narrow-gap melting polar reactive gas shielded arc welding disclosed by the invention provides a new technology with high efficiency, good quality, energy saving and low material consumption. Compared with traditional welding, by the adoption of the technology disclosed by the invention, the production efficiency is increased by 3 to 5 times, welding filler level is reduced by 50%, impact toughness at a low temperature of 40 DEG C below zero achieves more than 69J, and welding quality is also effectively guaranteed.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a narrow-gap molten active gas shielded arc welding (MAG) process suitable for leg racks of marine engineering equipment. Background technique [0002] The leg is one of the important components of offshore engineering equipment such as wind power installation ships, riprap leveling ships and jack-up drilling platforms, and the rack of the legs is the core of platform lifting, so the vertical welding of the rack is the most important part of the production of the legs. focus and key. At present, manual arc vertical welding is mostly used for the butt joint of pile legs and racks. During welding, the production processes such as welding the groove on the front side, carbon arc gouging from the back side, grooving, grinding, flaw detection, preheating, and back welding are adopted. There are many processes. , The quality stability of the product is poor, the qualified rate of one...

Claims

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Application Information

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IPC IPC(8): B23K9/173B23K9/235B23K9/23
CPCB23K9/173B23K9/235B23K33/00B23K2101/185B23K2103/04
Inventor 张华军杜渝陆汉忠兰虎包孔杜仕忠陈阿静
Owner SHANGHAI ZHENHUA HEAVY IND
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