Magnetic control heavy current MAG welding method useful for deep groove welding and equipment thereof

Abstract

The invention relates to MAG welding method and its equipment which is used in the deep groove welding. It belongs to welding field. The features of the method are that exciting coil and the magnetism conduction iron core set in its inner part are made up of magnetic field control parts; the exciting coil is produced magnetic field with the action of the excitation source; the magnetic field is transmitted from the up part of the magnetism conduction iron core to its down part, then to the welding area in the inner part of the groove; the size of the magnetic field can be adjusted by changing the exciting current and the distance between the exciting coil and the work piece. Its equipment includes two parts-the upper of the magnetism conduction iron core and the magnetism conduction iron core in its down part. The up and down part of the magnetism conduction iron core are hollow body. And their joint is set hollow heat resistance spacer and cavity used to water cooling. Not only in the MAG welding of the shallow groove work piece is the invention better than the existing performance, but also in the deep groove it can gain stable rotating jet transition.

Description

technical field [0001] The invention relates to a magnetically controlled high-current MAG welding method and equipment that can be used for deep groove welding, and is suitable for the field of welding technology. Background technique [0002] The magnetron high deposition rate melting electrode mixed gas shielded welding (MAG) method (national invention patent, patent number: ZL02116241.7) is to control the welding arc and droplet transfer process by adding a hollow coil to generate a longitudinal magnetic field. The stable rotating jet transition in the high current range can improve the weld formation and reduce the welding cost. At the same time, it also improves the welding production efficiency, so that the welding deposition efficiency increases from 144g / min of the traditional welding method to 345g / min, and realizes no High current MAG welding under the condition of helium shielding gas. [0003] At present, this method is only suitable for high-current MAG weldin...

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Problems solved by technology

[0004] However, when the groove depth is further increased, due to the above-mentioned welding equipment (see attached figure 1 ) in the nozzle (inner diameter greater than 100mm) is too large to penetrate into the groove, resulting in a sharp decrease in the magnetic field deep in the groove. At this time, it is no longer possible to increase the magnetic field by adjusting the excitation current or the distance between the nozzle and the workpiece. Efficiently Control the High Current MAG Welding Process

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