Topic
Gas metal arc welding
About: Gas metal arc welding is a research topic. Over the lifetime, 11706 publications have been published within this topic receiving 109555 citations. The topic is also known as: metal active gas welding & GMAW.
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TL;DR: A high efficiency TIG welding method was developed, which employs two electrodes within a single torch, making it well suited for application to the construction of large capacity LNG storage tanks and thick walled pressure vessels as discussed by the authors.
Abstract: A high efficiency TIG welding method was developed, which employs two electrodes within a single torch. This system is shown to produce consistent penetration in the groove wall and high deposition rate, making it well suited for application to the construction of large capacity LNG storage tanks and thick walled pressure vessels. Authors have applied this new TIG welding method in the construction of an inner tank for PCLNG storage tank. The material of tank wall is 9% Ni steel. Proper welding condition for vertical and horizontal welding position (peripheral welding position) were selected, and sound joint properties were confirmed. For the practical application, stable welding procedures were developed. In result, it achieved greatly improving joint quality and reducing construction time.
32 citations
Patent•
12 Apr 1983TL;DR: In this article, the authors used an ultrasonic vibratory welder for pre-heating the workpieces prior to welding and, thereafter, continuously monitoring the temperature of the anvil and of the welding tip during subsequent welding operations to insure their temperature remains within a pre-determined range during the entire welding cycle.
Abstract: Method and apparatus are provided for use in an ultrasonic vibratory welder for pre-heating the workpieces prior to welding and, thereafter, for continuously monitoring the temperature of the anvil and of the welding tip during subsequent welding operations to insure their temperature remains within a pre-determined range during the entire welding cycle. It has been found that weld characteristics, particularly weld size, shape, configuration and strength are dependent upon the temperature of the anvil and welding tip. Thermostatically controlled resistance heating means are provided in the anvil and/or in the welding tip for pre-heating of the workpieces. Automatic control means, are also provided for alternately heating and cooling the anvil and welding tip during the welding cycle.
32 citations
Patent•
24 Mar 2005TL;DR: The resistance welding method of different kinds of materials is the method for welding an iron material and an aluminum alloy material, and comprises the steps of: performing in advance a coating treatment at least to a portion of the aluminum alloy materials, where resistance welding is performed, with any of iron and iron-base alloy and forming a surface layer; and performing resistance welding of the iron and the aluminum Alloy material through the surface layer, and the resistance welding may be any of spot welding and projection welding as mentioned in this paper.
Abstract: The resistance welding method of different kinds of materials is the method for welding an iron material and an aluminum alloy material, and comprises the steps of: performing in advance a coating treatment at least to a portion of the aluminum alloy material, where resistance welding is performed, with any of iron and iron-base alloy and forming a surface layer; and performing resistance welding of the iron material and the aluminum alloy material through the surface layer, and the resistance welding may be any of spot welding and projection welding.
32 citations
Journal Article•
TL;DR: In this paper, an investigation about the use of out-of-phase current pulse technology as applied to the twin-wire gas metal arc welding (GMAW) process is presented.
Abstract: Out-of-phase current pulsing has been commercially claimed to be indispensable for minimizing magnetic interaction between arcs in the twin-wire gas metal arc welding (GMAW) process and reaching stable operations. This paper presents an investigation about the use of out-of-phase current pulse technology as applied to the twin-wire GMAW process. High-speed digital images were recorded with the objective of evaluating the metal transfer and the behavior of the voltaic arcs under the influence of out-of-phase current pulsing at different current levels. Conditions of in-phase and out-of-phase pulsing were evaluated and compared to no pulsed settings. A relationship between pulsing and pool oscillation was investigated, but it seems the natural frequency of the pool is the governing phenomena. Weldments were deposited on overlap joints in the flat position in order to study the resulting geometric characteristics. The results showed no evidence that out-of-phase current pulses can impose any reduction of arc and droplet attractions at a high current level, which is an attractive advantage of the twin-wire GMAW process. Concerning bead profiles, no remarkable influences were found. In summary, the results indicate that the need for out-of-phase pulsing machines is overstated and that conventional machines are totally capable of conducting quality weldments.
32 citations
TL;DR: Resistance spot weldability is defined as the acceptable welding current ranges as determined by the weld lobe in resistance spot welding as discussed by the authors, and it is defined in terms of the welding current.
Abstract: Resistance spot weldability is defined as the acceptable welding current ranges as determined by the weld lobe in resistance spot welding. Nowadays many studies have focused on the effect of weldin...
32 citations