Method of joining an inner metal pipe with an outer surrounding metal pipe
AssigneeNitro Nobel AB
InventorIngemar P. Persson
Life of this patent
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Abstract
A method of joining an inner metal pipe with a surrounding outer metal pipe comprising placing inside the inner pipe a contact body which prevents change of the inside diameter of the inner pipe and detonating an explosive around the outer pipe so that the inner surface of the outer pipe is metallurgically joined to the outer surface of the inner pipe. The contact body is a rigid body made of salt and the contact body is removed after the pipes are joined by dissolving the contact body in a fluid in which the salt is soluable.
Claims9
A method of joining an inner metal pipe with an outer surrounding metal pipe by welding by explosion such that the outer surface of the inner pipe is joined metallurgically with the inner surface of the outer pipe, the method comprising placing inside the inner pipe a contact body which prevents a change of the inside diameter of the inner pipe, said contact body being a rigid body made of salt.
Dependencies are inferred from the claim text.