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Method and device for resisting softening of electroslag welding joint

A welding head and electroslag technology, applied in auxiliary devices, welding equipment, auxiliary welding equipment, etc., can solve the problems of increasing welding residual stress, increasing the temperature gradient in the weld zone, and increasing the sensitivity of weld cracks. Solve the effect of softening, improving production efficiency, increasing residual stress and crack susceptibility

Active Publication Date: 2018-10-12
浙江江奥机械科技有限公司
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  • Application Information

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Problems solved by technology

Document 4 achieves the purpose of improving the structure of the weld seam and the heat-affected zone and refining the grains by accelerating the cooling of the weld seam during the welding process. Although this method is more effective in improving the embrittlement of the heat-affected zone, it directly cools the weld seam Accelerated cooling will increase the temperature gradient in the weld zone, thereby increasing the welding residual stress, resulting in a significant increase in the crack sensitivity of the weld

Method used

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  • Method and device for resisting softening of electroslag welding joint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Select 40mm thick Q345B as the test base material, the base material hardness is 152HV10. First assemble according to the conventional electroslag welding method, and then install four baffles on both sides of the weld. The positions of the baffles are 19.1 mm and 30.1 mm from the center of the weld; before welding, turn on the power of the air compressor to start working. The gas pressure in the air compressor is not lower than 0.8MPa; conduct electroslag welding on the base metal, the welding current is 380A, the voltage is 51V, after the welding process is stable, adjust the position of the nozzle in the baffle so that it is at the same level as the molten pool Then fix the air supply pipe on the lifting mechanism through the clamp, open the air compressor valve and start spraying gas to the softening zone of the weld seam, the gas flow rate is 45 L / min; during the welding process, adjust the lifting of the clamp fixed on the lifting mechanism The speed keeps the pos...

Embodiment 2

[0033] The test base metal and welding process are the same as in Example 1, only the gas flow rate of the air supply pipe is adjusted to 70 L / min, the measured high temperature residence time above 600 °C in the softening zone is 22s, and the minimum hardness value is 161 HV10, which is 9 HV10 higher than the hardness of the base metal.

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Abstract

The invention discloses a device for resisting softening of an electroslag welding joint. An air compressor, a lifting mechanism, a gas feeding pipe, a spray nozzle and baffles placed in certain areasof the two sides of a welding line are included. According to a method for resisting softening of an electroslag welding joint, mainly, the air compressor jets compressed gas into the baffles placedin the certain areas of the two sides of the welding line through the gas feeding pipe fixed to the lifting mechanism and communicating with the air compressor and the spray nozzle, so that the cooling speed after welding of an original welding softening area is increased, and the purpose of improving the tensile strength of the area is achieved. According to the method and device for resisting softening of the electroslag welding joint, by performing directional cooling on a portion, prone to be softened, in a welding heat affected zone, the high temperature keeping time after welding of theportion, prone to be softened, in the welding heat affected zone is shortened, and the chronic disease of softening of the electroslag welding welding joint is solved.

Description

technical field [0001] The invention relates to a method and device for anti-electroslag welding joint softening, belonging to the field of welding technology. Background technique [0002] Electroslag welding uses the resistance heat generated by the current passing through the slag as a heat source to melt the filler metal and the base metal, and form a firm connection between metal atoms after solidification. Compared with welding methods such as submerged arc welding and gas shielded welding, electroslag welding is more suitable for thick plate welding due to its high welding efficiency, especially for steel plates with a thickness greater than 30mm. It has been widely used in ships, pressure vessels, high-rise buildings and other fields. Welding of large cross-section structures, cylindrical structures and box girders, etc. However, due to the large heat input of electroslag welding, which generally exceeds 300KJ / cm, the high temperature residence time in the heat-af...

Claims

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Application Information

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IPC IPC(8): B23K37/00B23K25/00
CPCB23K25/00B23K37/00
Inventor 沈若松
Owner 浙江江奥机械科技有限公司
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