Welding thermal crack control device

Abstract

The embodiment of the invention provides a welding thermal crack control device. The welding thermal crack control device comprises a welding gun, a preheating coil and heating equipment, wherein thewelding gun and the preheating coil are arranged at the position right above a welding seam of a workpiece to be welded, the preheating coil is arranged on one side of the welding gun, and the heatingequipment is used for controlling the preheating coil to heat the workpiece to be welded according to preset induction heating frequency, preset heating temperature and preset heating time. Accordingto the welding thermal crack control device provided by the embodiment of the invention, in the welding process, the preheating coil firstly preheats the welding seam of the workpiece to be welded, the working condition is not deteriorated, the welding is carried out by using a small current, and the welding thermal crack tendency is reduced; the temperature gradient of the whole or local part ofthe workpiece to be welded is reduced, and the production of columnar crystals with large thickness and obvious crystallization direction can be prevented and controlled beneficially; and meanwhile,the improvement of welding line energy for preventing and treating welding the thermal crack is avoided, the structure of a near seam region is not overheated, and the mechanical property of the structure of the near seam region is guaranteed.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a welding hot crack control device. Background technique [0002] Welding heat cracking is a common problem in the welding process. Welding heat cracking mainly refers to the cracks generated when the weld seam and the metal in the heat-affected zone cool to the high temperature zone near the solidus line during the welding process, among which crystallization cracks are the most common. Crystalline cracks only exist on the weld, and are generally distributed longitudinally with the centerline of the weld, or distributed in an arc on both sides of the centerline. These cracks are distributed along the primary crystallization, especially columnar crystals. The crystallization cracks mainly include: Crystal segregation is initiated. [0003] In order to prevent welding hot cracks, it is generally possible to start from the aspects of metallurgical and mechanical factors. From the...

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Problems solved by technology

[0004] Appropriately increasing the welding line energy and increasing the preheating temperature can reduce the hot crack tendency of the weld metal, but increasing the welding line energy will overheat the metal near the seam, and increasing the preheating temperature will worsen the working conditions

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