Basic metal cored electrode
AssigneeThe Lincoln Electric Company
InventorsChang-Shung Chai, David A. Fink, John Gonzalez
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Abstract
A consumable welding element for arc welding comprising a steel sheath surrounding a compacted core containing metal alloying powders and an essentially 100% basic compound in an amount less than about 1.60% of the total weight of said element. The basic compound is calcium fluoride powder which is preferably in the range of about 0.1% to about 0.9% calcium fluoride powder by total weight of the element. As another feature the core of the element contains a specific agent for decreasing the amount of diffusible hydrogen in the weld metal. This new element may be a filler metal for TIG welding; however, it is preferably a consumable electrode for MIG welding.
Claims22
A consumable welding element for arc welding steel comprising a steel sheath surrounding a compacted core containing an agent for reducing the amount of diffusible hydrogen under about 5 ml/100 g in the weld metal, said agent selected from the group consisting of a polymer containing fluorine, elemental zinc, a zinc alloy, and combinations thereof wherein said fluorine polymer is non-hydroscopic and essentially inert and does not contain hydrogen or nitrogen said agent constitutes between about 0.1 to 0.24 weight percent of said element.
A method of making a consumable welding element for high strength steel to reduce the diffusible hydrogen in the weld metal to under about 5 mil/100 g, said method including the steps of:
- (a) providing a steel sheath with a central bore;
- (b) loading said bore with particles to reduce diffusible hydrogen in the weld metal, said particles, selected from the group consisting of a polymer containing fluorine, elemental zinc powder, a zinc alloy powder and any combinations thereof, said fluorine polymer having non-hydroscopic and essentially inert properties and does not contain hydrogen or nitrogen, said particles constitute between about 0.1 to 0.24 weight percent of said element, and,
- (c) drawing said sheath into a desired diameter.
Dependencies are inferred from the claim text.