Special longitudinal seam inside welding machine for stainless steel and composite steel welded pipes and use and using method of special longitudinal seam inside welding machine

Abstract

The invention belongs to the field of inside seam welding equipment for a stainless steel welded pipe or a composite welded pipe, and particularly relates to a special longitudinal seam inside welding machine for the stainless steel and the composite steel welded pipes and use and a using method of the special longitudinal seam inside welding machine. The welding machine is characterized by comprising a control device and a welding arm, wherein one end of the welding arm is connected with the control device, while the other end of the welding arm is connected with a mounting plate by a universal joint; a welding gun and a wire feeding nozzle are fixed on the mounting plate; the welding gun is connected with the welding machine; and the wire feeding nozzle is connected with a wire feeder. The control device comprises a controller, a welding gun fine-tuning device and a video monitoring device; the video monitoring device comprises a camera and a display; and the camera is fixed on the mounting plate or is fixed on the welding gun in a position adjacent to the welding gun. According to the welding machine, the welding arm with the welding gun and the wire feeding nozzle is extended into a steel pipe, and a worker completes the welding operation outside a steel pipe under the remote control of the control device, so that the labor intensity is low and the machining accuracy is high.

Description

technical field [0001] The invention belongs to the field of internal seam welding equipment for stainless steel welded pipes or composite pipes, and specifically relates to a special machine for internal welding of stainless steel and composite steel welded pipe longitudinal seams and its application and usage method. Background technique [0002] The existing technology of small-diameter composite pipe is mechanical composite pipe. It is precisely because the base / lining interface of the mechanical composite pipe is a mechanical interference fit rather than a metallurgical bond, and the wall thickness of the liner is much smaller than the thickness of the base pipe, so Under bending conditions, the mechanical composite pipe lining may wrinkle, which will lead to the failure of the composite pipe. Therefore, the composite welded pipe is made of hot-rolled metallurgical composite plate, which avoids the occurrence of such problems, which makes the stainless steel composite p...

AI Technical Summary

Problems solved by technology

Manually welded pipe requires welders to enter the steel pipe to weld the anti-corrosion layer in advance, so the minimum diameter of the processed pipe is also about 600mm in diameter. If the diameter of the steel pipe is smaller, personnel cannot enter the pipe and welding cannot be carried out.

The current fully automatic welding equipment is limited by the size of the fuselage, and the minimum diameter of the steel pipe for welding the inner seam cannot be less than 500 mm.

[0003] In addition, in the field of stainless steel welded pipes, the welding of thick-walled and small-diameter steel pipes can basically only adopt the processes of manual backing, automatic welding filling and covering, automatic backing, single-side welding, double-sided forming, and automatic welding filling and covering.

The weakest link of this process lies in the manual priming process. The welding quality is affected by human factors, which leads to poor forming, and the quality cannot be guaranteed. The automatic welding bottoming has large gaps, large filling volume, high welding costs, and high labor intensity for workers. The processing efficiency is low, and the product quality cannot be guaranteed

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