Lincoln Global, Inc.

Jon P Chiappone

Craig B Dallam

Robert J Weaver

Randall M Burt

Jonathan Sterling Ogborn

Ashish Kapoor

Teresa Melfi

Janet Michelle Morse

In a stick electrode for electric arc welding having a center alloy wire and an outer cellulose coating which coating includes powdered fluxing agents, alloy powder, cellulose powder and a binder. The improvement involves forming the binder as a solution of sodium silicate and 61-78 percent by weight of the binder. The binder comprises 25-35% of the coating to produce at least about 4% by weight of water in the electrode. Furthermore, the fluxing agent is titanium dioxide with a percentage greater than 12 percent of the coating.

Cellulose coated stick electrode

A stick electrode for depositing an high strength weld metal bead on a workpiece where the yield strength of the weld metal is between 85 ksi and 125 ksi irrespective of the cooling rate. The electrode deposits weld metal having 0.80-1.85% by weight manganese, 0.25-0.50% by weight molybdenum, 1.25-2.50% by weight nickel, and less than 0.07% by weight carbon, wherein the ratios of the carbon, manganese and molybdenum are adjusted to provide a carbon equivalent in deposited weld metal in the range of 0.17 to 0.30 and preferably less than 0.22.

Stick electrode

A system and method of rating the arc maintainability of an electric arc welding stick electrode by creating an arc between the electrode and a workpiece; moving the electrode along the workpiece while maintaining the arc; decreasing either the current or the voltage until a point is reached where the arc is extinguished; determining the open circuit voltage at the point; and, rating the electrode based upon at least the open circuit voltage point.

Method of rating a stick electrode

Systems for rating a stick electrode

A welding electrode comprising a metal core and a flux coating at least partially coated on an outer surface of said metal core, and also including a end coating material which at least partially inhibits porosity of a weld bead formed during the welding operation.

A method of rating the arc maintainability of an electric arc welding stick electrode by creating an arc between the electrode and a workpiece; moving the electrode along the workpiece while maintaining the arc; decreasing either the current or the voltage until a point is reached where the arc is extinguished; determining the open circuit voltage at the point; and, rating the electrode based upon the open circuit voltage point.

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.

Determining quality of a stick electrode

Methods and systems are disclosed for characterizing a welding consumable, such as flux or an electrode, and/or for comparing two or more welding consumables for use in narrow gap deep groove welding operations, including creating test welds on fixtures having joint grooves of various angles for a given groove depth, followed by controlled standardized non-aggressive slag removal operations, and quantification of the amount of slag remaining in the groove, wherein the welding consumables are each characterized using the same fixtures, welding conditions, workpiece groove depths, groove angles, and removal operations, to construct a set of results, such as a table or rating, by which the individual welding consumables can be rated and/or a determination can be made as to which of two consumables provides superior performance with respect to ease of removal in deep groove welding operations.

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Willoughby, OH, United States of America

Jon P Chiappone