Large-thickness workpiece vacuum preheating and electron beam welding device

Abstract

The invention relates to a large-thickness workpiece vacuum preheating and electron beam welding device which comprises a vacuum chamber, a heating device, a moving platform, an electronic gun, a clamping tool and a to-be-welded workpiece. The to-be-welded workpiece is composed of two large-thickness workpieces. The heating device comprises an upper heating assembly, a lower heating assembly and three side wall heat insulation protection assemblies. In the vacuum environment, workpiece high-temperature preheating is achieved, the cooling speed is effectively reduced, generation of quenched structures in welding seams and heat affected zones is avoided, and the problems that the welding seam crack tendency of high-strength steel and high-strength titanium alloys and other products is large,and ductility and toughness of welding seams are poor are solved through a high-temperature preheating and electron beam welding method.

Description

technical field [0001] The invention relates to the field of metal material welding, in particular to a vacuum preheating electron beam welding device for large-thickness workpieces. Background technique [0002] With the development of material science, the application demand of new high-strength titanium alloys and high-strength steels is increasing. However, due to the increase in material strength, high-strength alloys have higher cold crack susceptibility during welding, and rapid cooling after welding will cause a large number of internal martensitic However, when the preheating temperature is high, the difficulty of manual welding is significantly increased, especially when the preheating temperature is high. When the thermal temperature is higher than 300 °C, the surface of the high-strength titanium alloy will react with hydrogen and oxygen in the air, and when the temperature is higher than 500 °C, it will react with nitrogen, which cannot be implemented in the atm...

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Problems solved by technology

[0004] Aiming at the defects of the prior art, the present invention designs a vacuum preheating electron beam welding device for large thickness workpieces, realizes high temperature preheating in a vacuum environment, effectively reduces the cooling rate, and avoids the generation of hardened structures in the weld seam and the heat affected zone. , using high-temperature preheating and electron beam welding methods to solve the problems of high-strength steel, high-strength titanium alloy and other products with a large tendency to crack welds and poor weld plasticity and toughness

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