Electro-gas welding device and electro-gas welding method

Abstract

The invention relates to the technical field of welding, in particular to an electro-gas welding device and method. The device comprises a base plate, a welding gun, a water cooling sliding block and an ultrasonic transducer. The base plate is attached to one face of each of the two to-be-welded steel plates. Wherein a gap is formed between the two to-be-welded steel plates; the welding gun is used for clamping a welding wire and supplying power to the welding wire, so that an electric arc is formed between the welding wire and the to-be-welded steel plate; the electric arc is used for melting the welding wire and the parts, located on the two sides of the gap, of the to-be-welded steel plate to form molten steel; the water-cooling slide block is attached to the other surfaces of the two steel plates to be welded and crosses the gap; the ultrasonic transducer is fixed to the surface, away from the to-be-welded steel plate, of the water cooling sliding block and arranged in the direction perpendicular to the to-be-welded steel plate, and the ultrasonic transducer is used for applying ultrasonic waves to the molten steel formed in the gap through the water cooling sliding block so that equiaxed grains can be formed after the molten steel is cooled. According to the electro-gas welding device and method provided by the invention, a welding seam structure with uniform equiaxed crystals can be obtained.

Description

technical field [0001] The invention relates to the technical field of welding, in particular to a gas-electric vertical welding device and method. Background technique [0002] Gas-electric vertical welding is a gas-shielded arc welding method developed from ordinary gas-shielded gas-shielded welding and electroslag welding. Plate welding can also be applied to the welding of bridge box girder webs and medium and heavy plates of large storage tank side plates of corresponding sizes. [0003] In the related art, when the steel plates are welded, there is a gap between the two steel plates to be welded. The high temperature generated by the arc is released through the welding wire, so that the front end of the welding wire and part of the steel plate around the gap are melted. Fill, cool and finish welding. In order to prevent the molten molten steel from flowing, a backing plate is arranged on one side of the above-mentioned gap, and a slider is arranged on the other side ...

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Problems solved by technology

However, since the temperature of the backing plate and the slider is different, the cooling rate of the molten steel in contact with the two is different. Therefore, the molten steel near the side of the liner is cooled to form fine equiaxed crystals, and the molten steel on the side of the slider is cooled. A large columnar cooling structure is formed, and there is obvious boundary ferrite precipitation at the grain boundary. This structure leads to the unbalanced properties and strength of the weld

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