Pulse burial arc welding process and welding device for boiler membrane type tube panels and tube rows

Abstract

The pulse submerged arc welding process for membrane type boiler tube bank features that the welding process includes the steps of: setting welding current, welding voltage and welding speed in the welding power supply; regulating the pulse frequency, pulse width ratio, base current and voltage, peak current and voltage in the arc pulse controller; regulating the relative positions of water cooling wall and the fins on the tracks of the welding machine and clamping the water cooling wall and the fins with the fixture; moving the beam to the end of the water cooling wall and regulating the angle of welding gun and welding wire; and welding while moving the beam until completing the welding of the whole water cooling wall pipe. The welding apparatus is one pulse submerged arc welding machine comprising power supply, frame, welding wire feeding mechanism, welding wire and fixture, and features that each welding power supply is provided with one arc pulse controller.

Description

technical field [0001] The invention relates to a pulse submerged arc welding process and welding equipment for a boiler membrane tube panel tube row, which can be used for the welding of tube rows in the boiler manufacturing industry and belongs to the technical field of water-cooled wall manufacturing technology. Background technique [0002] A few days ago, domestic supercritical power plant boilers have been greatly developed, and the demand for products is extremely strong. But supercritical product structure is very different from subcritical boiler. Generally, the thickness of the fins used in the water wall of subcritical boilers is basically 6mm, and the welding speed is 0.9-1.1m / min. However, when the thickness of the fins used in the water wall of the supercritical boiler reaches 9.5 mm, the original welding process cannot meet the technical requirements of the product, and both sides of the fins must be grooved, which will inevitably make the annealed disc fins ...

AI Technical Summary

Problems solved by technology

However, when the thickness of the fins used in the water wall of the supercritical boiler reaches 9.5 mm, the original welding process cannot meet the technical requirements of the product, and both sides of the fins must be grooved, which will inevitably make the annealed disc fins The work hardening of the fins makes the welding assembly more difficult, and greatly increases the manufacturing cost of the fins. If the bevel is not opened, the welding penetration cannot meet the requirements.

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