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Large non-standard device thick-plate all-position welding method

A welding method and all-position technology, applied in the field of steel structure welding, can solve the problems of uneven stress and easy deformation of the weldment, and achieve the effect of stable structure, small overall deformation and good plasticity of the weldment.

Inactive Publication Date: 2015-05-20
温江
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Problems solved by technology

[0004] In order to overcome the shortcomings of the existing welding methods such as uneven stress and easy deformation of the weldment, the technical problem to be solved by the present invention is to provide an all-position welding method for thick plates that can ensure small deformation of the weldment and high weld quality

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] The process flow for large thick plate welding is generally: welding procedure qualification → construction preparation → blanking, assembly → preheating → welding → visual inspection → hydrogen elimination after welding → non-destructive testing → annealing.

[0020] Welding process evaluation includes groove selection and welding parameter selection. The weld groove type of the present invention is selected according to HG20586-1998 standard DU36 and asymmetrical X-shaped groove. The asymmetrical X-shaped groove refers to two weldments. The groove on the side is asymmetrical, taking the plate thickness of 70mm as an example, such as figure 1 As mentioned above, a 9m edge planer and a semi-automatic oxyacetylene flame cutting machine are used for the groove. The specific size of the groove should be selected according to the thickness of the steel plate. The gr...

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Abstract

The invention discloses a large non-standard device thick-plate all-position welding method. The large non-standard device thick-plate all-position welding method comprises the following steps of machining an asymmetric X-shaped groove at the welded position of a weld part and then vertically assembling the weld part, adopting a far infrared electric heating method to preheat the weld part on two sides of a weld joint and using an infrared digital temperature measuring instrument to perform detection, firstly conducting tack welding in the smaller groove of the asymmetric X-shaped groove during part welding and then adopting a multi-layer multi-channel mode to perform multi-point simultaneous welding, sequentially perform heating, heat preservation and air cooling to eliminate hydrogen after welding is completed, and finally performing appearance inspection and whole annealing. According to the large non-standard device thick-plate all-position welding method, angle deformation after welding is small and symmetry is good by forming the reasonable asymmetric X-shaped groove, the multi-point simultaneous welding and the multi-layer multi-channel mode are adopted to enable all positions of the whole weld part to be stressed evenly and enable overall deformation to be small, and finally the whole annealing is adopted to eliminate internal stress and enable the whole weld part to be more stable in structure and better in plasticity.

Description

technical field [0001] The invention relates to the technical field of steel structure welding, in particular to an all-position welding method for thick plates of large-scale non-standard equipment. Background technique [0002] With the development of machinery, energy, transportation, chemical industry, construction and other industries in recent years, various welding structures are constantly developing towards functionality and large-scale, especially the welding of thick plates has also developed rapidly in various fields. Due to the large degree of restraint and the large tendency of hardening, thick plate welding has a high tendency to produce cracks and difficult welding. Mastering thick plate welding technology is conducive to increasing the company's market share. [0003] Due to the large amount of deposited metal of filler welding consumables during welding of thick and ultra-thick plates, the welding time is long, the total heat input is high, the weld seam is...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/02B23K9/235
Inventor 温江马明远彭斌欧如钢谢江凌易英
Owner 温江
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