Shielding gas

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

Composite wire for gas shielded arc welding

Abstract: PURPOSE: To execute vertical up welding with high efficiency and to obtain the composite wire which has the good migratability of droplets and decreases the amt. of the spatters to be generated by specifying the grain size constitution, incorporating TiO 2 at a specific ratio into the wire and incorporating specific components at specific ratios therein. CONSTITUTION: A flux is filled in the sheath made of a steel. The grain size constitution is so specified that the particles having the grain size exceeding 149μ are incorporated into the wire at 10wt.% and the particles having 44μ grain size or below at ≤30wt.%. The TiO 2 is incorporated into the wire at 3.5W7.0wt.% of the total weight of the wire. Further, contains 0.4W1.0wt.% ZrO 2 , 0.1W1.0wt.% Al 2 O 3 , 0.3W1.0wt.% Si, 1.2W3.2wt.% Mn, 0.1W0.6wt.% Al, 0.03W0.3wt.% total of 1 or 2 kinds of Na, K:Na, K, and 0.01W0.2wt.% F. The vertical up welding is thereby executed with high efficiency and the amt. of the spatters to be generated is decreased; in addition, the working efficiency of welding is improved. COPYRIGHT: (C)1989,JPO&Japio

Steel wire for carbon dioxide shielded arc welding and welding process using the same

Abstract: A steel wire for use in the straight polarity carbon dioxide shielded arc welding, which comprises 0.003 to 0.20 mass % of C, 0.05 to 2.5 mass % of Si, 0.25 to 3.5 mass % of Mn, 0.015 to 0.100 mass % of REM (rare earth metals), 0.001 to 0.05 mass % of P, 0.001 to 0.05 mass % of S, and the balanced amount of Fe and inevitable impurities; the steel wire which further comprises 0.0100 mass % or less of O; the steel wire which still further comprises one or more of 0.02 to 0.50 mass % of Ti, 0.02 to 0.50 mass % of Zr and 0.02 to 3.00 mass % of Al; the steel wire which still further comprises 0.0001 to 0.0150 mass % of K; the steel wire which still further comprises 3.0 mass % or less of Cr, 3.0 mass % or less of Ni, 1.5 mass % or lass of Mo, 3.0 mass % or less of Cu, 0.015 mass % or less of B, 0.20 mass % or less of Mg, 0.5 mass % or less of Nb, 0.5 mass % or less of V, 0.020 mass % or less of N; and a welding process which uses one of the above steel wires. The welding process allows the spray transfer of a molten droplet and thus allows the reduction of sputtering and also the formation of a weld bead of an excellent shape, in the carbon dioxide shielded arc welding using a shield gas containing CO2 gas as its main component.

Effect of sulfur and oxygen on weld penetration of high-purity austenitic stainless steels

Abstract: Convective flow during arc welding depends upon the surface tension gradient (dy/dT, Marangoni flow), buoyancy, arc drag force, electromagnetic force, shielding gas, and the viscosity of the melt. The Marangoni and the buoyancy-driven flow are the major factors in controlling weld penetration in ferrous alloys, especially austenitic stainless steels such as 304 and 316. Small variations in the concentration of surfactants, such as sulfur and oxygen, in stainless steels cause significant changes in the weld penetration and depth/width (D/W) ratio of the fusion zone. Gas-tungsten arc (GTA) welds were done on low- and high-sulfur 304 and 316 heats using pure argon and argon/oxygen shielding gases. Also, laser beam (LB) welds were done on the 304 and 316 heats using pure argon as the shielding gas. Increase in the sulfur content decreased the D/W ratio for the GTA 304 welds using pure argon, but for the case of LB 304 welds the results were the opposite. For the GTA 316 welds and LB 316 welds, increase in sulfur increased the D/W ratio of the fusion zone. Oxygen increased the D/W ratio of both the 304 and 316 GTA welds.