Filler metal

About: Filler metal is a research topic. Over the lifetime, 11152 publications have been published within this topic receiving 86590 citations.

Low-Power Laser/Arc Hybrid Welding Behavior in AZ-Based Mg Alloys

Abstract: The low-power laser/arc hybrid welding behaviors of the AZ-based Mg alloys in similar and dissimilar joints are examined in this study in terms of welding parameters, fusion-zone characteristics, mechanical properties, welding temperature fields, and laser-induced arc plasma/plume. Experiments were conducted using a low-power (300 W) pulsed Nd:YAG laser with a gas tungsten welding arc. The results show that the AZ-based Mg alloys can be easily welded by laser/arc hybrid welding process. The introduction of low-power laser beam can stabilize the welding arc even at a high-speed welding, and spattering behavior of laser welding disappeared due to the introduction of welding arc. With the increases of arc power, a higher weld depth can be obtained, and the weld depths for laser and arc acting in combination (laser/arc) are 2 times higher than those of for laser and arc acting separately (laser + arc) in optimal conditions. The postweld tensile strength of Mg alloys could recover ∼80 to 100 pct of the original strength in similar or dissimilar joints. The fatigue strength in laser/arc hybrid welded specimens is equal to that of the unweld base metal.

TIG welding method and welding apparatus

Abstract: A TIG welding apparatus comprises a welding current supply means for supplying an electric current, a shield gas supply means for supplying shield gases, a tungsten electrode connected to the welding current supply means, a welding torch disposed coaxially around the tungsten electrode and provided with inner and outer double gas shields having gas jetting nozzles through which the gases are jetted, a plurality of wires to be fed to a portion at which the gases are jetted through the gas jetting nozzles, a wire feeding means, and a heating means connected to the wires, except at least one wire, for heating the wires. A TIG welding method is carried out by using such welding apparatus through the steps of supplying shield gases into the inner and outer gas shields and jetting the shield gases through the jetting nozzles to a portion at which a welding arc is generated, feeding continuously wires, except at least one wire, under a condition heated by the heating means to that portion as hot wires through the wire feeding means and feeding continuously the at least one wire under a condition not heated to the portion as cold wire through the wire feeding means substantially at the same time of the feeding of the hot wires.

Process for brazing workpieces of aluminum containing material

Abstract: A process for brazing aluminum-containing work-pieces wherein the brazing filler metal contains components which lower the surface tension and the viscosity of the molten brazing filler metal, and which lower the interfacial tension between the brazing filler metal and the aluminum-containing work-pieces. Useful components are Bi, Sr, Ba, Sb and Be. The brazing filler metal may be used with or without flux.