A method and system to manufacture workpieces employing a high intensity energy source to create a puddle and at least one resistively heated wire which is heated to at or near its melting temperature and deposited into the puddle as droplets.

Method and system for additive manufacturing using high energy source and hot-wire

An improved method of arc welding uses a single power supply connected to opposed welding torches placed on both sides of a workpiece Each torch is connected to a different polarity lead of the power supply and forms a separate arc with the workpiece When a current is supplied to the first torch, it is guided from the first electrode, through the first arc, the workpiece, the second arc, and to the electrode of the second torch This guiding function improves the penetration, concentration, as well as the directional stability of the arc This permits the effective and efficient welding of relatively thick workpieces using existing equipment at low current levels

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Method of arc welding using dual serial opposed torches

An electrospark alloying apparatus (20, 120, 220) includes a main body member, a collet (61) coupled to the main body member, and a heat sink (60) adjacent the collet (61). The collet (61) is adapted to receive and hold a consumable electrode (21). The apparatus (20, 120, 220) can also include a drive (31) for rotating the electrode (21). Further, the apparatus (20, 120, 220) can include an inert gas supply (29) and a discharge opening (50) in the main body member for facilitating lamellar gas flow of inert gas from the inert gas supply (29) around the electrode (21). A method of electrospark alloying includes electrospark alloying a workpiece (22) with a consumable electrode (21) and cooling the electrode (21) during the electrospark welding.

Method and apparatus for electrospark alloying

A process for buttwelding metal workpieces (12) having bevelled joint preparations using an automatic GTAW welder (20) using filler wire (32) includes preparing the bevelled workpieces (12) with bevelled joint areas having minimal land thickness at the root extremities; placing the prepared workpiece joint sections together with an open gap between their adjacent root extremities, the gap having a minimum dimension that avoids harmful compression stress between the workpieces due to weld shrinkage and a maximum dimension that avoids filler wire penetration of the gap; fusion welding the open root area of the adjacent workpieces (12) with a root pass weld using an automatic GTAW welder (20) supplied with filler wire (32) and a shield gas including 1 to 10 % hydrogen and the balance inert gas; and then promptly overlaying the root pass weld with at least one additional filler weld pass using an automatic GTAW welder (20) supplied with filler wire (32) and hydrogen-free shield gas.

Method of welding

An end portion of each of two parts (10, 11) is machined and the machined end portions of the parts (10, 11) are arranged in facing positions to form a welding bevel (13) extending in a longitudinal direction between the parts (10, 11), whereafter a filler metal is deposited into the welding bevel (13). The welding bevel is a narrow bevel with side walls at an aperture angle of no more than 5° relative to the longitudinal central plane of the bevel (13). A nickel alloy comprising 18-32 % of chromium is deposited into the welding bevel. The method is particularly suitable for joining a pressurised water nuclear reactor vessel tubing and an austenitic stainless steel primary circuit pipe.

Method for joining two parts of different kinds by heterogeneous butt welding, and uses thereof

A method of welding metal products, at least one of which being made of nickel or a nickel alloy, comprises the steps of generating an arc between the products to be welded serving as a positive pole and a tungsten electrode held by a welding torch serving as a negative pole, emitting a shielding gas consisting of an argon-based mixed gas containing one or both of hydrogen and helium from a confining gas nozzle concentric with the tungsten electrode, thus confining the apparent flaring angle of the arc within 80 degrees, and moving the welding torch along the weld line while feeding the tip of a filler wire to a part of the molten pool directly below the arc. This method is applicable to the welding of metal products, at least one of which is made of nickel or a nickel alloy.

Hiroshi C

Papers

Method of welding nickel or nickel alloy products