Demagnetizing and deflective blow preventing device of pipeline welding line

Abstract

The invention discloses a demagnetizing and deflective blow preventing device of a pipeline welding line. The device comprises a first carbon steel shielding plate and a second carbon steel shielding plate, wherein the first carbon steel shielding plate and the second carbon steel shielding plate are both semi-arc plates; the first carbon steel shielding plate is provided with a first welding port, and the second carbon steel shielding plate is provided with a second welding port; and the first carbon steel shielding plate and the second carbon steel shielding plate are connected through a shielding plate connecting device. The device has a shielding effect on a magnetic field around a pipeline welding joint to prevent deflective blow of welding arc under the influence of the magnetic field, thereby reducing the construction difficulty while pipeline welding and guaranteeing the welding quality.

Description

Technical field [0001] The invention relates to a welding equipment, in particular to a pipeline welding seam demagnetization and anti-bias blowing device. Background technique [0002] At present, when pipeline welding operations are carried out at the construction or maintenance site, because the nozzle welding arc is interfered by the surrounding magnetic field, the arc cannot be guaranteed to be in the same direction as the axis, but is biased to one side. The phenomenon of arc bias is called arc magnetic bias. blow. The main reason is that the remanence in the pipeline and the magnetic field caused by the arc are superimposed, which changes the uniformity of the magnetic field around the arc, shifts the arc to the weaker side of the magnetic field, and affects normal welding production. Magnetic bias will cause the welding arc to swing and be unstable, resulting in poor weld formation. The droplet transfer is irregular and cannot be transferred to the root of the groove to...

AI Technical Summary

Problems solved by technology

The main reason is that the residual magnetism in the pipeline is superimposed with the magnetic field caused by the arc, which changes the uniformity of the magnetic field around the arc and makes the arc shift to the side where the magnetic field is weak, which affects the normal welding construction and production.

Magnetic deflection blowing will cause unstable welding arc swing, resulting in poor weld formation

The transfer of the droplet is irregular, and it is impossible to transition to the root of the groove to form a molten pool, which is likely to cause defects such as incomplete penetration, incomplete fusion, and undercut at the root. During argon arc welding, it can also weaken the protective atmosphere around the arc and make the molten pool Harmful gases such as air are mixed in, causing pores and slag inclusions

Heavy magnetic bias makes it difficult to ignite the arc, destroys the stability of the arc combustion, and even causes the arc to go out, and molten droplets or slag splash out from the welding pool, making it impossible to weld

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