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US 4,287,402 AGranted
Controlling upsetting during welding of a split tube
AssigneeMannesmann Aktiengesellschaft
InventorsErhard Hentzschel, Erhard Jaspert, Kurt Niederhoff
Life of this patent
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Abstract
Markings are placed alongside the gap of a split tube and their distance is measured downstream from the point of welding; the measuring result is used to control upsetting pressure in the weld print.
Claims4
Method of controlling upsetting pressure during resistance welding of adjoining edges of a split tube having been made from strip or skelp, comprising the steps of
- providing markings to both sides of a gap between the not yet welded edges upstream from the welding;
- determining the width of the gap in the plane of marking;
- measuring the distance between the markings downstream from the welding;
- and
- controlling upsetting by maintaining said distance between prescribed limits.
2 more elements
Dependencies are inferred from the claim text.