Shielding gas

About: Shielding gas is a research topic. Over the lifetime, 6697 publications have been published within this topic receiving 58668 citations.

Flux enhanced high energy density welding

Abstract: A method of shielding a weld. The method includes melting a substrate to form a weld pool using a high energy density welding technique of plasma arc welding, laser beam welding, or electron beam welding; and delivering a flux to the weld pool to produce a slag effective to shield against atmospheric contaminants.

Multi-variable optimisation of the quality characteristics of fiber-laser cladded Inconel-625 composite coatings

Abstract: Inappropriate choice of processing and materials parameters when re-manufacturing industrial equipment, via laser cladding (LC) technique, has adverse implications for attaining durability of equipment in terms of functional performance, efficient lead time and cost savings for equipment repairers. In an attempt to promote the adoption of LC as an efficient equipment re-manufacturing process, this study employs central composite design (CCD) and response surface modeling (RSM) to build mathematical models for optimising the quality characteristics (dilution ratio and microhardness and LC process efficiency) of a composite coating. The quality characteristics of the coating, comprising of Inconel 625 matrix reinforced with tungsten carbide (WC) particles, were optimised as functions of laser energy density, inconel content in the composite coating and shielding gas flow rates. Evidence from this study establishes that laser energy density is the dominant factor which influences all the output responses. It was also revealed that predicted values of the quality characteristics agree with the experimental results within the permissible range of the LC process and materials variables. Consequently, dilution ratio was minimised as coating's microhardness and process efficiency were maximised with appropriate combination of laser energy density, inconel content and shielding gas flow rates. Finally, it may be inferred from this analysis that quality characteristics are optimised at 67.6 wt% inconel content, laser energy density (18.60 J/mm2) and career/shielding gas flow rates (8.86 l/min) with desirability value of 1.00.

Method of welding a carbon steel and an austenitic stainless steel together and resultant structure

Abstract: Method of welding a carbon steel and a austenitic stainless steel involves using high density energy beam like a laser beam or electron beam Welding using high density energy beam is effective to obtain a high precision welding For the purpose of obtaining both high precision and no cracks, and no deformation, the method of the invention controls the structure of a weld portion to be a mixed structure of an austenitic structure and not greater than 20 wt % of a ferritic structure

Arc welding gun with handle assembly

Abstract: A welding gun handle assembly connectable to a supply cable supplying a consumable welding electrode, shielding gas and electrical power, all under the control of a trigger operated switch in the handle assembly including a relocatable thumb rest which may be attached on either side of the handle assembly above the trigger of the switch so that the trigger may be operated in a natural manner by both right and left handed operators, a grip portion having finger grooves for placing at least one finger over the trigger of the switch, cooling vents through the handle assembly to permit circulation of cooling air therethrough, connection apparatus for connecting the welding gun to the supply cable, a gooseneck assembly and an adapter on the handle for connection therewith and a replaceable liner for guiding the consumable welding electrode from the connection apparatus to the welding gun, through the removable gooseneck

Gas control system for a plasma arc torch

Abstract: An apparatus and process is provided for controlling the selection and supply pressure of gases used in a plasma arc torch. A plurality of pressurized feed gases are selectively routed by solenoid gas valves to one or more motorized pressure regulators. A separate regulator controls the pressurized output of a selected pre-flow gas, plasma gas, shield gas, and post flow gas. A microprocessor establishes recommended pressures for each type of gas and prevents operating pressures from being used which may damage a plasma arc torch.