Friction stir welding bottom auxiliary heating device for light alloy plate

Abstract

The invention discloses a friction stir welding bottom auxiliary heating device for a light alloy plate. A base plate is fixed to a welding workbench, a first concave groove is formed in the center ofthe surface of the base plate, and MCH lead wire grooves are formed in the two sides of the base plate; heating block assemblies are arranged in the first concave groove, and each heating block assembly is sequentially provided with a copper alloy block, a second heat insulation pad, a metal ceramic heating piece MCH and a base from top to bottom; and the metal ceramic heating pieces MCH are clamped and fixed through high-temperature flat-end wave springs, the high-temperature flat-end wave springs are positioned and fixed to the bases, high-temperature heat conduction grease is coated between the metal ceramic heating pieces MCH and the copper alloy blocks, and the bases are connected with the copper alloy blocks. According to the friction stir welding bottom auxiliary heating device, the plurality of heating block assemblies are arranged on the base plate and cooperate with the metal ceramic heating pieces MCH and corresponding heating circuits to achieve the bottom and local preheating assisted FSW test under the condition that an FSW welding machine is not greatly modified.

Description

technical field [0001] The invention belongs to metal welding technology, in particular to a bottom auxiliary heating device for friction stir welding of light alloy plates. Background technique [0002] Friction stir welding (FSW) is a solid phase joining technology of materials. For FSW process, the welding temperature field is directly related to the flow of materials and weld structure. Therefore, the temperature field control in the welding process is particularly important. In general, the temperature field of friction stir welding is "three-dimensional asymmetric". That is, the surface temperature of the weld is high, and the bottom temperature is low; the temperature of the advancing side is high, and the temperature of the retreating side is low; the temperature of the welding start section is low, and the temperature of the end section is high. Therefore, the bottom, the retreating side and the initial section can be heated to balance the temperature field, thereb...

AI Technical Summary

Problems solved by technology

The existing friction stir welding auxiliary heating devices have different structures and principles. As far as heat sources are concerned, there are induction heating, resistance heat transfer, current assist, flame heating and other schemes, but most of them are difficult to heat the bottom or part of the weldment. Or the energy density is too high, it is not suitable for heating light alloys and the equipment is bulky and the flexibility is low

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