US 12,528,134 B2Granted

Method for coaxially welding two tubes together

AssigneeKranendonk Beheersmaatschappij B.V.

InventorsMarinus Hermanus Maria Boksebeld, Johannes Petrus Hubertus Justin Geraerds, Chris Johannes Astrid Maria Warmenhoven, Bart Van Dam

Life of this patent

Estimating the term…

patentgrep

Loading patent…

Abstract

The invention provides a method for coaxially welding together two tubes. Axial ends of the tube walls of the respective tubes are machined in such a way that they have a stepped shape over at least a first part of the tube wall thicknesses. The stepped shapes complement each other. The method comprises the subsequent steps of A positioning the first tube and the second tube coaxially with respect to each other, wherein the machined axial ends contact each other at least over the first part of the first tube wall thickness and the first part of the second tube wall thickness and wherein the first stepped shape of the machined axial end of the first tube wall and the second stepped shape of the machined axial end of the second tube wall fit into each other, and wherein a seam is present between the first parts of the first tube and the second tube thicknesses, B fixating the first tube and the second tube at discrete positions over the circumference of the seam via attachment welds, C welding the first tube and the second tube to each other over the entire circumference of the first tube and the second tube, wherein the circumferential weld extends over the entire thickness of the first tube all and over the entire thickness of the second tube wall.

A method for coaxially welding together a first metal tube having a first tube wall and a second metal tube having a second tube wall, wherein the inner diameter of the first tube equals an inner diameter of the second tube and wherein an axial end of the first tube wall is machined in such a way that the axial end of the first tube wall, when seen in a longitudinal cross section, has a first stepped shape over at least a first part of a first tube wall thickness, the first part extending from an inner side of the first tube wall, and wherein an axial end of the second tube wall is machined in such a way that the axial end of the second tube wall, when seen in a longitudinal cross section, has a second stepped shape over at least a first part of the second tube wall thickness, the first part extending from an inner side of the second tube wall, and wherein the first stepped shape and the second stepped shape complement each other, the method comprising subsequent steps of:

A:
positioning the first tube and the second tube coaxially with respect to each other, wherein the respective machined axial ends contact each other at least at a location of the first part of the first tube wall thickness and the first part of the second tube wall thickness, the first stepped shape of the machined axial end of the first tube wall and the second stepped shape of the machined axial end of the second tube wall fitting into each other such that, as a result of the fit of the first stepped shape and the second stepped shape a movement of the first tube and the second tube with respect to each other in a radial direction is blocked;
B:
fixating the first tube and the second tube at a number of discrete positions at a circumference of seam via attachment welds;
and
C:
circumferentially welding the first tube and the second tube over a entire circumference of the first tube and the second tube, wherein the circumferential weld extends over the entire thickness of the first tube wall and over the entire thickness of the second tube wall,
wherein the first part extending from the inner side of the first tube wall and comprising an inner annular end face and an outer annular end face, the outer annular end face being smaller than the inner annular end face and having a thickness of at least 1.0 mm.

5 more elements

Abstract

Claims20