Showing papers on "Shielded metal arc welding published in 1970"

Method of submerged arc welding high tensile strength steel having trace elements of vanadium or niobium

Abstract: Steel is welded by submerged arc welding techniques using a steel wire comprising 0.2-2.5% Mn, 0.002-0.05% B and one or more of 0.005-0.5% Ti, A1 and Zr and optionally a flux composition comprising a non-metallic flux powder and a metallic powder. The metallic powder contains 5-75% Fe, less than 5% Si and less than 10% Mn.

Resistance welding and soldering of coated - sheet metal

Abstract: A current is passed through the decoated welding point of the coated metal strip to be welded to the opposite pole of an electrode. The welding current passes from this metal strip to the second metal strip through decoated inner surfaces. Pressure is applied together with the welding current and the coated outer layer of the metal strip is unharmed.

Welding paste for resistance welding copper parts

Abstract: A WELDING PASTE FOR JOING COPPER PARTS BY RESISTANCE WELDING BY COATING SUCH PARTS TO BE JOINED AT THE POINTS PRIOR TO WELDING WITH THE PASTE CONTAINING A MIXTURE OF POWDERED SILVER OR POWDERED SILVER AND A SOLDERING FLUX.

Coated electrode for electric arc welding of steel of various structure

Abstract: The present invention relates to welding coated electrodes and is used for welding steel of various structure. The electrode comprises a rod containing carbon, silicon, manganese, molybdenum, nickel, titanium and iron, and a coating of the fluoric-calcium type.

Inhibition of spatter in metal welding operations

Abstract: 1,205,626. Welding by fusion. L. T. BOWERS. 16 Nov., 1967, No. 52136/67. Heading B3R. To inhibit adherence of a weld spatter to a metal surface, e.g. of a gas nozzle of a gas shielded metal arc welding torch or of a workpiece, the surface is treated with camphor. The camphor may be mixed with a carrier, e.g., petrolatum kerosene, gasoline or a wax, and with liquefiers such as turpentine or organic oils or stiffeners such as cetyl alcohol, palmityl or spermaceti. The resulting solid, paste or liquid may be applied as a coating to the surface to be protected.

The Influence of Shield Gas Compositions on the Arc Temperature in Gas-Shielded Metal-Arc Welding

Abstract: The influence of shield gas compositions in argon-nitrogen, argon-oxygen, argon-carbon dioxide and argon-hydrogen systems on the arc temperature was studied by means of the spectral line intensity method.The findings in this work are as follows:1) The arc temperature increases slightly with an increase of welding current.2) The arc temperature does not undergo a noticeable change with arc voltage.3) The arc temperature increases with an increase in nitrogen, oxygen, carbon dioxide and hydrogen additions.The arc temperature in argon-hydrogen gas mixtures is highest, and the one in argon-carbon dioxide gas mixtures is lowest.4) The arc temperature seems to be influenced by electrode materials.

Parameters for Pressurized Inert Gas Metal Arc Welding of Aluminum.

Abstract: This study was designed to establish the significance of various process parameters in Pressurized Inert Gas Metal Arc (PIGMA) welding. Specifically, the effects of arc voltage, filler metal speed, travel speed, and chamber pressure were determined. The measured responses were arc mode and stability, weld appearance, soundness, area, width, penetration, reinforcement, and depth-towidth ratio. Using predetermined combinations of parameters, bead-on-plate welds were made on an 8 in. diameter by 1 in. wall Type 1100 aluminum cylinder. The filler metal was 0.030 in. diameter Type 718 aluminum alloy. The welding was performed in a pressure chamber with the cylinder in the horizontal-rolled position. After welding, the welds were X-rayed and visually and metallographically examined. For purposes of analysis, the raw data of each response were treated using a multiple regression analysis technique. By this technique, the variability in ratings due to each independent variable and to lower order interactions was determined. Calculated ratings were obtained for each combination of parameters. The results of the study were derived using the trends of the calculated ratings. Findings are briefly described below: Chamber pressure, in general, when increased, acts to reduce weld appearance, weld width, and arc stability and increases the depth-to-width ratio. Increased pressure shortens the arc and changes the transfer mode to short circuiting. Arc voltage, when increased from 22 to 28 v, exhibits relatively minor influence on weld soundness and appearance but did increase weld penetration and area. Travel speed, when increased from 60 to 120 ipm, decreased weld penetration, width, and cross-sectional area. ELDON D. BRANDON is with the Rocky F la t s Division. The Dow Chemical Co., Golden. Colo. P a p e r presented a t the AWS 51st Annual Meeting held in Cleveland. Ohio, dur ing J u n e 8-12, 1970. Filler metal feed speed, was the most significant factor affecting weld appearance, soundness, reinforcement, penetration, width, area, and depth-to-width ratio. The best appearing and soundest welds occurred at lower filler metal feed rates. As would be expected, the size of the weld increased with filler metal feed rate. Using criteria of acceptable appearance and soundness, the maximum depthto-width ratio (1.2:1) was obtained at 29 v. 800 ipm filler metal feed speed. 70 ipm travel, and 82 psi absolute pressure. Introduction Pressurized Inert Gas Metal Arc or PIGMA welding is a relatively new technique being used at the Rocky Flats Plant to reduce weld-metal porosity to extremely low levels when other techniques fail. Other desirable conditions, such as a narrower, more Fig. 1—Welding chamber and fixture used for PIGMA welding study Fig. 2—Close-up of torch/filler metal feeder assembly concentrated arc profile, have been realized. The PIGMA process is essentially the same as gas metal-arc welding except that the torch and workpiece are enclosed within a pressure chamber. For welding, the chamber is pressurized to some elevated pressure in the range of 20 to 100 psia. The chamber may or may not be evacuated before being pressurized. Inert gas is normally used to backfill the chamber after evacuation. However, compressed air may be used if an inert atmosphere is not required. After the desired pressure is reached, the welding proceeds in the normal manner except, of course, the operation must be carried out by remote control. The basic process and equipment have been described in more detail by Barker.* The current program was designed to establish the significance of various process parameters in PIGMA welding. Several response variables were measured to find their relationships to the basic welding parameters. Also, a wide range of variable levels was used. Thus, a set of limits was established wherein acceptable welds could be made. Experimental Materials The selected base metal, type 1100 a l u m i n u m , was c y l i n d r i c a l , 8.28 in. outside diameter by 1 in. wall by 13 in. long. 1100 aluminum is a 99% purity alloy containing very small amounts of copper, silicon, and iron. The filler metal was a 0.030 in. diameter 718 aluminum alloy. This alloy consists of 12% silicon, the balance aluminum. Before welding, the cylinder was » Barker . R.. "PIGMA Welding—A Methold for Reducing Weld Poros i ty , " Welding Journa l , 44 (1), Research Suppl. , l-s to 6-s (1965). 510-s ; N O V E M B E R 1970 Table 1—Summary of Pressurized Inert Gas Metal Arc Welding Procedure Process Base Metal Filler metal Preweld cleaning (base metal) Joint configuration Temperature control Welding position Polarity Shielding gas (torch) Chamber gas Power supply

Flux for welding titanium and its alloys

Abstract: 1,208,916. Welding by fusion. INSTITUT ELEKTROSVARKI IMENI E O. PATONA. 27 Dec., 1967, No. 58642/67. Heading B3R. [Also in Division C7] A flux for welding Ti and its alloys contains by weight: CaF 2 .. .. .. 77A5-99A5% Simple sodium halide .. . 0A5-2A0% e.g. NaF and NaCl. The flux may also contain 5-21% BaCl 2 and is used in automatic argon arc welding at a welding rate of 40-60 m./hr.

Welding electrode having a non-conductive tip for semi-automatic continuous arc welding machine

Abstract: A coated welding electrode for use in a semi-automatic continuous arc welding apparatus is provided with a layer of predetermined thickness of a material which is electrically insulative at normal atmospheric temperature painted on the tip end thereof.

Nitrogen Content and Porosity of Aluminum Weld Metal

Abstract: Effect of nitrogen partial pressures in the welding atmospheres of several gas mixtures on the nitrogen content of aluminum weld metals was systematically studied.The important conclusions are as follows;1. Aluminum weld metals absorb a large quantity of nitrogen in the welding atmospheres containing nitrogen.2. The nitrogen contents of weld metals increase with increasing arc voltage and decrease with increasing welding current.3. Anomalous nitrogen absorption by weld metal is observed at low atmospheric pressures.4. The existence of an oxidizing gas in arc atmospheres does not contribute to the enhancement of nitrogen absorption by aluminum weld metals.