Electromagnetic control electro-gas welding method and equipment thereof

Abstract

The invention relates to an electromagnetically controlled gas-electric vertical welding (EMS-EGW) method, which is to set an external magnetic field above or / and near the side of the gas-electric vertical welding (EGW) molten pool (3), such as an excitation coil that provides an excitation current by an excitation power supply , produce time-varying or constant electromagnetic stirring and external magnetic field to produce electromagnetic stirring effect; the electromagnetic field promotes the forced movement of the metal fluid in the gas-electric vertical welding pool, and comprehensively controls the solidification process of the weld metal. With the cooperation of gas protection, the method of electromagnetically controlled gas-electric vertical welding (EMS-EGW) is realized on the workpiece. The electromagnetic control gas-electric vertical welding (EMS-EGW) device of the present invention adds excitation equipment on the existing basis, and the excitation equipment is composed of an excitation coil and an excitation power supply that provides excitation current for the excitation coil. The invention breaks through the traditional gas-electric vertical welding method, and provides a new idea for improving gas-electric vertical welding; reduces welding defects, reduces welding costs, improves welding quality and production efficiency, and ensures product reliability; The appearance is well formed; the equipment is simple and easy to popularize and apply.

Description

technical field [0001] The invention relates to gas-electric vertical welding (EGW) technology, in particular to an electromagnetically controlled gas-electric vertical welding (EMS-EGW) method and equipment, belonging to the field of welding technology. Background technique [0002] Gas-electric vertical welding (EGW) is a gas metal arc welding method developed from common metal gas metal arc welding and electroslag welding. It is mainly used in the welding of thicker low-carbon steel and medium-carbon steel such as oil tanks, large-diameter thick-walled pipes, and hull plates. It can also be used in the welding of austenitic stainless steel and other metal alloys. The thickness of the plate It is most suitable at 12-80mm. It is one of the efficient welding techniques, which has the advantages of good welding quality, high efficiency, fast deposition speed and low comprehensive cost. Gas-electric vertical welding uses similar to electroslag welding, the water-cooled coppe...

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Problems solved by technology

Regarding patents on gas-electric vertical welding technology, for example, the Chinese patent number is 200610200782.9, and the name of the invention is "Inverted Vertical Seam Gas-electric Vertical Welding Method for Large Floating Roof Storage Tanks", which discloses a wall panel that adopts butt-welded parts Carry out pretreatment, use the carbon dioxide gas shielded welding machine to carry out bottom welding on the wall plate, use the gas electric vertical welding machine to carry out the welding method of filling the cover surface on the wall plate after the bottoming, this invention solves the problem of large floating roof The problem that water-cooling pads cannot be installed on the back of the welding seam in the tank inverted construction, but the process is more complicated, which increases the welding cost and welding process; Arc starting welding method without backing" discloses a method of one-time welding forming using a gas-electric vertical welding machine, which mainly includes two processes of arc starting and normal welding, wherein the normal welding is automatically carried out by a gas-electric vertical welding machine; it utilizes The arc starting plate or the circular seam is used as the backing when the arc is started and the welding specification is controlled to improve the welding quality. However, the welding process of this invention is complicated and involves a lot of equipment, which makes it difficult to guarantee the welding quality.

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