Determining quality of a stick electrode

Details Determining quality of a stick electrode Determining quality of a stick electrode

2007-12-11

2007-12-11

Shaw, Clifford C. (Department: 1725)

Electric heating

Metal heating

By arc

C219S13700R, C228S103000

Reexamination Certificate

active

11357863

ABSTRACT:
A method of measuring the quality of a stick electrode used in forming the root bead of a pipe joint, which electrode has a wire diameter, a length substantially greater than 12 inches and an upper exposed rod head. The method comprises: preparing a standardized workpiece including two spaced plates with a groove between the plates having a set profile including a lower gap duplicating the root gap of the pipe joint and mounting the standardized workpiece on an incline with the groove facing upwardly where the incline is at a fixed known angle. Then a stick electrode of the type to be measured is selected and the rod head of the selected electrode is connected to the power lead of a DC power source set to a given output current correlated with the type of electrode. A root bead is laid in the gap from an upper start position on said workpiece by progressively filing the gap and then discontinuing the root bead welding at a lower end position when a given length of the electrode has been consumed; and, measuring the distance between the upper start position and the lower end position with the run out distance being indicative of a quality characteristic of the electrode. This method can be used to measure the run out per time instead of run out per electrode consumed length.

REFERENCES:
patent: 2294650 (1942-09-01), Bechtle
patent: 6703585 (2004-03-01), Suzuki

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