US 5,400,951 A · Method of brazing a joint portion of an intake manifold with preplaced brazing

Abstract

In brazing a first metal piece having a tubular joint portion of predetermined length at an end thereof and a second metal piece having a bore for inserting the extremity of the joint portion thereinto by replaced brazing with the extremity of the joint portion inserted in the bore, a plurality of axial grooves having a depth of 0,3 to 1,5 mm and arranged at a spacing of 5 to 30 mm in the circumferential direction are formed in the outer peripheral surface of joint portion of the first metal piece. Each of the grooves has one end extending to the outside of the bore of the second metal piece when the joint portion is inserted in the bore. The gas or residue of flux produced during brazing escapes through the grooves, whereby voids or like defects are prevented from occurring in the fillet of the brazed joint. Since the grooves are all filled up with the brazing filler metal, the brazed joint is given a sufficient bond strength and prevented from permitting leakage there-through.

Claims10

Dependent claims

A method of brazing together a joint, comprising the steps of:

providing a first metal piece having a tubular joint portion of predetermined length at an end thereof and a second metal piece having a bore for inserting the extremity of the joint portion of the first metal piece thereinto, wherein the first metal piece is the branch pipe of an intake manifold, and the second metal piece is the plenum chamber of the intake manifold or the connection member thereof to be attached to a cylinder head;
providing preplaced brazing on the extremity of the joint portion of the first metal piece which is inserted in the bore of the second metal piece;
providing the joint portion of the first metal piece on its outer peripheral surface with a plurality of grooves which extend axially of the first metal piece and which are arranged at a spacing circumferentially thereof, each of the grooves having one end extending to the outside of the bore of the second metal piece when the joint portion is inserted in the bore;
and
heating the joint to braze the joint together.

2 more elements

Dependencies are inferred from the claim text.

Method of brazing a joint portion of an intake manifold with preplaced brazing

Life of this patent

Method of brazing a joint portion of an intake manifold with preplaced brazing

Life of this patent

Abstract

Claims10