Base plate and doubling plate expansion method in explosion welding of large-thickness oxygen-free copper doubling plate

Abstract

The invention discloses a base plate and doubling plate expansion method in explosion welding of a large-thickness oxygen-free copper doubling plate. The expansion method comprises the steps that (1) continuation plates are additionally arranged on a base plate and a doubling plate correspondingly; (2) the dimensions of the continuation plates are determined based on calculation of the thicknesses of the base plate and the doubling plate and adopted-explosive parameters; (3) the doubling plate and the continuation plates are connected through bolts; and the connecting mode between the base plate and the continuation plates is determined according to the material of the base plate, wherein, the thickness h of the oxygen-free copper doubling plate is larger than or equal to 15 mm, and the thickness of the base plate is larger than or equal to 1.0 h. According to the base plate and doubling plate expansion method in explosion welding of the large-thickness oxygen-free copper doubling plate, the strength and the quantity calculating formula for the bolts are determined, quantification is realized, blindness eliminating is facilitated, the method of controlling the detonating end to be not welded together and the boundary effect of the detonating end is determined, and reliable welding of the four edges of a composite plate is guaranteed. The welding ratio of the composite plate welded through the process is up to 90%, the utilization ratios of the base plate and the doubling plate are greatly improved, the bonding strength of the welding surface is in accordance with the strength law of bimetal solid-phase metallurgy combination, the bonding interface of the composite plate is in excellent minute wave shape, and the welding quality requirement of the composite plate is completely met.

Description

technical field [0001] The invention belongs to the technical field of explosive welding, and in particular relates to a base cladding expansion method in an explosive welding method of a bimetallic (316L stainless steel, oxygen-free copper) clad plate with a cladding plate of large thickness and special quality requirements . Background technique [0002] The thermonuclear fusion power generation test reactor requires a bimetal composite plate with special quality requirements, and the composite plate is required to be welded and composited by a 316L stainless steel plate and a high-purity oxygen-free copper plate. Traditional electric welding, friction welding and other welding methods have problems such as complex equipment, high cost, low welding strength, and microscopic defects at the bonding interface. Explosive welding has the advantages of high welding quality and metallurgical bonding at the bonding interface. However, it has been found in practice that the oxygen...

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Problems solved by technology

Traditional electric welding, friction welding and other welding methods have problems such as complex equipment, high cost, low welding strength, and microscopic defects at the bonding interface, while explosive welding has the advantages of high welding quality and metallurgical bonding at the bonding interface.

However, it has been found in practice that the oxygen-free copper plate with a thickness greater than 15mm is used as the cladding explosive welding. If the existing technology is used, the welding rate is very low, and it decreases with the increase of the cladding thickness, resulting in waste of precious metals; Using the related patented technology that only adds extension boards to the cladding boards will cause two problems. One is that the welding rate is still low, and the other is that it is difficult to achieve effective welding between large-thickness oxygen-free copper boards and extension boards.

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