The invention relates to a method for welding a plurality of strands (33) of one or more electrical conductors (22), comprising at least the following steps: (a) preparing the strands (33) to be welded such that at least the free ends (22a) of adjacent strands are axially offset by a non-zero distance d. (b) melting the free ends (22a) of the strands thus arranged in order to weld them without addition of material.

An assembly configured to seal an end plug on a plugged end of a fuel tube is disclosed. The assembly includes a seal weld chamber assembly and a helium flow stop assembly (HFSA) removably coupled to the seal weld chamber assembly. The seal weld chamber assembly includes a welding chamber and a plunger fluidically coupled to the welding chamber. A helium source is configured to supply helium to the welding chamber. The end plug of the fuel tube is positionable within the welding chamber via the plunger. The HFSA is configured to prevent helium from escaping the welding chamber through the plunger.

An electrode unit for inert gas welding by means of a non-consumable. The electrode unit includes an electrode holder and an electrode held firmly and undetachably in the electrode holder and having an electrode tip at a front end. The electrode protrudes beyond the electrode holder by means of the electrode tip on a first longitudinal end of the electrode holder. A gas guide channel is formed in the electrode holder, with an inlet opening located toward a second longitudinal end of the electrode holder. At least one outlet opening is oriented transversely with respect to a longitudinal extent of the electrode holder and located offset from the inlet opening, when viewed in the direction of the longitudinal extent, toward the first longitudinal end. The electrode unit is able to be efficiently cooled during the welding operation and has a reduced tendency to jam or wedge due to thermal expansions.

An electrode unit for inert gas welding by means of a non-consumable. The electrode unit includes an electrode holder and an electrode held firmly and undetachably in the electrode holder and having an electrode tip at a front end. The electrode protrudes beyond the electrode holder by means of the electrode tip on a first longitudinal end of the electrode holder. A gas guide channel is formed in the electrode holder, with an inlet opening located toward a second longitudinal end of the electrode holder. At least one outlet opening is oriented transversely with respect to a longitudinal extent of the electrode holder and located offset from the inlet opening, when viewed in the direction of the longitudinal extent, toward the first longitudinal end. The electrode unit is able to be efficiently cooled during the welding operation and has a reduced tendency to jam or wedge due to thermal expansions.

A GTAW system and a welding method suitable for ultra-narrow gaps, and belongs to the technical field of narrow gap welding. The device includes a argon arc welding machine, a GTAW torch, a welding trolley, a wire feeding device, and a gas protection device. The GTAW torch includes a rotating motor, a rotating tungsten, a conductive system, and a gas supply system. The non-axisymmetric rotating tungsten is drived by the rotating motor through the central rotating shaft. The conductive system is used for connecting and supplying electric power from the argon arc welding machine, and the air supply system is used for providing shielding gas into the welding torch. The GTAW torch is fixed on the welding trolley, and the GTAW torch is moved by the welding trolley, and the wire feeding device moves synchronously with the welding torch.

A GTAW system and a welding method suitable for ultra-narrow gaps, and belongs to the technical field of narrow gap welding. The device includes a argon arc welding machine, a GTAW torch, a welding trolley, a wire feeding device, and a gas protection device. The GTAW torch includes a rotating motor, a rotating tungsten, a conductive system, and a gas supply system. The non-axisymmetric rotating tungsten is drived by the rotating motor through the central rotating shaft. The conductive system is used for connecting and supplying electric power from the argon arc welding machine, and the air supply system is used for providing shielding gas into the welding torch. The GTAW torch is fixed on the welding trolley, and the GTAW torch is moved by the welding trolley, and the wire feeding device moves synchronously with the welding torch.

A container system for radioactive waste and method for using the same is provided. The system includes a canister configured for holding radioactive waste and a lid system. In one embodiment, the lid system comprises a two-part lid assembly including a confinement lid and a shielded lifting lid. The confinement lid is detachably mounted to the confinement lid. In use, the lifting lid supports the confinement lid for lifting and placement on the canister. The lifting lid further shields operators while the confinement lid is mounted to the canister. Thereafter, the lifting lid is removed and may be reused for confinement lid mountings on other canisters. In one embodiment, the confinement lid is bolted to the canister. The canister may be disposed in a protective overpack for transport and storage.

A hardfacing metal composition and method of restoring worn work string tubing by application of a hardfacing metal to the worn regions of the work string tubing.

A hardfacing metal composition and method of restoring worn work string tubing by application of a hardfacing metal to the worn regions of the work string tubing.

Provided is a welded structural member with excellent stress corrosion cracking resistance, which includes: a 7000-series aluminum alloy material that has a chemical composition containing 6.6% by mass to 8.5% by mass of Zn, 1.0% by mass to 2.1% by mass of Mg, 0.10% by mass to 0.20% by mass of Zr, and 0.001% by mass to 0.05% by mass of Ti, with a remainder including Al and unavoidable impurities, and includes a metallographic structure that is a fibrous structure; and other aluminum alloy material welded with the 7000-series aluminum alloy material. In this welded structural member, when an electrical conductivity of the 7000-series aluminum alloy material before an artificial aging treatment is defined as X % IACS and the electrical conductivity of the 7000-series aluminum alloy material after the artificial aging treatment is defined as Y % IACS, the following equation is satisfied: 0.120≤(Y/X−1)≤0.250 is satisfied, and a difference in the electrical conductivity of the 7000-series aluminum alloy material between a mother portion other than a weld heat-affected zone and the weld heat-affected zone is 5% IACS or less.