主权项 |
1. A method for making T-branch joints for pipes, said method comprising making a hole in a pipe to be branched and attaching a branch pipe by welding to the edges of the hole, the welding being conducted from inside the pipes, wherein the hole is made smaller than the internal diameter of the branch pipe with edges of the hole providing a step which extends inside the internal diameter of the branch pipe, and that the material of the step is melted by said internal welding to form part of a weld joint.
|