Electric heating – Metal heating – Weld rod structure
Patent
1990-03-23
1991-03-12
Shaw, Clifford C.
Electric heating
Metal heating
Weld rod structure
21914624, 21914641, B23K 3510
Patent
active
049994794
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to the field of welding, and in particular to an electrode wire comprising a metal body and a charge.
BACKGROUND OF THE INVENTION
Nowadays the consumable-electrode arc welding in shielding (oxidizing and inert) gases is the most widely used method of welding in the industry. In construction and on erection sites there is used unshielded consumable-electrode arc welding. Used as consumable electrodes are electrode wires of solid section and electrode wires having inner cavities filled with a powdered charge. A solid-section wire is essentially a homogeneous monolithic long metal rod. The electrode wire having inner cavities is a composite material comprising a thin-walled metal sheath of tubular or more complex section, and a charge. The charge enclosed in the inner cavity defined by the electrode wire sheath is a mechanical mixture of metal powders (iron powder, ferroalloys, alloying powders), slag-forming and stabilizing constituents. The ratio of cross-section area of the charge-filled cavity in the electrode wire having inner cavities to cross-section area of the whole wire usually equals from 0.5 to 0.8.
In welding with the use of solid-section wires both in shielding gases, especially oxidizing ones, and without additional shielding there occurs an increased spattering of electrode metal, as well as an unsatisfactory weld formation. To prevent formation of pores in the process of welding low-carbon and low-alloy steels, the electrode wires of solid section obligatorily comprise deoxidizers such as silicon, manganese, titanium, aluminium, having a closer affinity for oxygen than iron, as well as in some cases alloying constituents such as chromium, vanadium, molybdenum. The deoxidizers and alaloying elements present in the electrode wire worsen its ductility, make the process of manufacturing a small (0.6 to 1.6 mm) diameter wire needed for welding more complicated and expensive. It should be noted that the better quality of weld metal is required, the greater amount of alloying and deoxidizing elements will be contained in the wire and the lower will become its ductility (deformability). However, the presence of any of presently known combinations of alloying and deoxidizing elements in the composition of the solid-section wire fails to prevent spattering of electrode metal, as well as to substantially improve formation of a weld surface when welding in the shielding gases and to provide the required performance of the weld metal when using unshielded arc welding.
The electrode wires having inner cavities filled with the charge make it possible to obtain quality welds featuring high performance both in gas-shielded and unshielded arc welding. Ability of the electrode wire having inner cavities to deform in the process of cold working changes but slightly with a greater or smaller amount of alloying constituents present in the charge. However, in contrast to the solid-section wires the electrode wires having inner cavities are difficult-to-manufacture and need special feeding mechanisms having several pairs of feed rolls and applying inconsiderable unit pressure on the surface of wire made, as a rule, of cold-rolled low-carbon steel from 0.15 to 0.5 mm thick. Metal powder constituents in the composition of the charge of the electrode wire, mixed with slag-forming constituents are susceptible to corrosion, which limits the storage life of such wires; therefore the welding process with use of the electrode wire having inner cavities is insufficiently reliable for obtaining high-quality welds.
The charge of the electrode wire having inner cavities in spite of great amount of metal constituents (iron powder and ferroalloys) present therein does not conduct electric current and therefore, in the process of welding with use of such a wire, melting of its core considerably lags behind melting of its metal sheath. As a result of insufficient heating voluminous portions of the charge pass into a welding pool without melting-down, which decreases the effectivenes
REFERENCES:
patent: 3555240 (1971-01-01), Gloor
patent: 4137446 (1979-01-01), Blanpain
Logiiko Gennady P.
Mischanin Vasily G.
Nikiforov Boris A.
Paton Boris E.
Schegolev Georgy A.
LandOfFree
Electrode wire does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electrode wire, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electrode wire will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-449640