All position narrow gap hot wire inert gas tungsten shielded welding process

Abstract

The invention discloses an all-position narrow gap hot filament inert gas tungsten electrode shielded welding process. The process includes the pre-welding preparation step, the backing welding step, the hot welding step, the filling welding process and the postweld heat treatment step. A one-layer two-welding-bead mode is adopted in the backing welding step, and in the welding process, welding wires respectively point to one sidewall of a groove. A one-layer one-welding-bead mode is adopted in the hot welding step, and in the welding process, the welding wires swing back and forth in the gap of the groove, point to the sidewall of the groove and stay for a while. A one-layer one-welding-bead hot filament mode is adopted in the filling welding process, and in the welding process, the welding wire swings back and forth in the gap of the groove, points to the sidewall of the groove and stays for a while. The all-position narrow gap hot filament inert gas tungsten electrode shielded welding process has the advantages of being high in production efficiency and low in welding filler amount; the production efficiency is improved two to three times that of a traditional welding process, the welding filler amount is reduced by 60 percent, the adaptability of the root gap of the groove can reach two millimeters, and minus-40-degree low-temperature impact toughness can reach above 69 J, so the welding quality is effectively guaranteed.

Description

technical field [0001] The invention relates to the field of welding technology, and more specifically relates to an all-position narrow-gap hot wire inert gas tungsten shielded welding (TIG) process suitable for large-thick-plate high-strength steel structures of marine engineering equipment. Background technique [0002] Large thick plate high-strength steel structures are widely used in marine engineering equipment, such as oil drilling platforms, wind power installation ships and riprap leveling boats. The leg window panels are made of Q690 or A514 steel, with a maximum thickness of 80mm. . The following problems exist in the welding and manufacturing of pile legs of marine engineering equipment with large thick plates and high-strength steel: [0003] 1) The all-position welding of large thickness components mainly adopts manual arc welding, multi-layer multi-pass welding, and improving welding quality and efficiency is the first issue to be considered. [0004] 2) La...

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Problems solved by technology

[0004] 2) Large thick-walled structures are usually made of high-strength materials, which have poor weldability and require preheating before welding. The labor intensity of workers is high and the production environment is harsh

[0005] 3) The rigidity of the large thick-walled complex structure is high, resulting in high residual stress after welding, and it is difficult and expensive to stress-relieve annealing, and once the deformation is difficult to correct

[0006] 4) The large size of the structure makes it difficult to apply automatic welding and requires special equipment

At present, there is no good breakthrough in narrow gap inert gas tungsten shielded welding (TIG)

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