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US 3,937,916 AGranted
Rotating arc welding method and apparatus
AssigneeWelding Research, Inc.
InventorDavid Sciaky
Life of this patent
Estimating the term…
Abstract
Apparatus for welding parts, such as pipes, end to end by means of an electric arc which is caused to rotate along the adjacent edges of the pipes. Two separate magnetic fields are used to cause the arc to follow a spiral path along the edges so that pipes having a wall thickness greater than one quarter of an inch may be welded.
Claims7
An apparatus for welding two parts along their adjacent edges by means of a magnetically propelled electric arc comprising;
- means for supporting the two parts to be welded so that their adjacent edges are separated by a gap,
- means for causing an electric arc to be produced across the said gap,
- a first means for generating a magnetic field between the said edges which causes the arc to move along them;
- a second means for generating a second magnetic field between and flowing parallel to the said edges which will cause the said arc to be urged in a radial direction while being propelled by the said first magnetic field,
- means for controlling the arc current and means for controlling the second said means for generating magnetic fields;
- and,
- means for pressing the said parts together.
4 more elements
A method for welding two parts along their adjacent edges comprising the steps of;
- clamping the two parts to be welded so that their adjacent edges are separated by a gap;
- causing an electric arc to be produced across the said gap;
- generating a radial magnetic field between the said edges for causing the arc to move along said edges;
- generating a second magnetic field concentric to said parts between the said edges to cause the said arc to be urged in a radial direction while being propelled by the first mentioned magnetic field so that the arc describes a spiral motion;
- controlling the arc current so that it follows a predetermined program of arc current with respect to time;
- and,
- pressing the said parts together at the said edges.
4 more elements
Dependencies are inferred from the claim text.