Topic
Shielded metal arc welding
About: Shielded metal arc welding is a research topic. Over the lifetime, 4462 publications have been published within this topic receiving 40560 citations. The topic is also known as: manual metal arc welding & flux shielded arc welding.
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TL;DR: Analysis of emissions from gas metal arc welding and gas tungsten arc welding processes for various combinations of base and filler alloys can be used by employers to identify and control potential hazards associated with the welding of aluminum alloys and can provide the basis for hazard communication to employees involved in the weld of these alloys.
Abstract: Fabrication and repair of aluminum components and structures commonly involves the use of electric arc welding. The interaction of the arc and the metal being welded generates ultraviolet radiation, metallic oxides, fumes, and gases. Aluminum is seldom used as the pure metal but is often alloyed with other metals to improve strength and other physical properties. Therefore, the exact composition of any emissions will depend on the welding process and the particular aluminum alloy being welded. To quantify such emissions, The Aluminum Association sponsored several studies to characterize arc welding emissions by the gas metal arc welding (GMAW) and gas tungsten arc welding (GTAW) processes for various combinations of base and filler alloys. In all cases, the tests were conducted under conditions that could be found in a production weld shop without forced ventilation. The concentrations of each analyte that a welder could be exposed to were greatly affected by the welding process, the composition of the ba...
16 citations
08 Nov 2004
TL;DR: In this paper, it was shown that the different arc modes during the stages of contact bouncing are influencing not only the material transfer but also the contact welding, and the different welding behavior can be explained in terms of the corresponding arc roots.
Abstract: Under certain conditions surprisingly shorter bounce arcs cause stronger welds than the much longer lasting arcs, if the shorter lasting arcs, also shorter in length, are of the anode arc mode while the longer arcs are of the cathode arc mode. The different welding behaviour can be explained in terms of the corresponding arc roots. Thus it appeared that the different arc modes during the stages of the contact bouncing are influencing not only the material transfer but also the contact welding.
16 citations
TL;DR: In this paper, the fracture toughness of 304 stainless steel pipe was investigated in the temperature ranging from room temperature to 162°C and the results obtained are summarized as follows: the tensile strength noticeably increases as the temperature becomes lower while the yield strength is relatively insensitive to temperature.
Abstract: Stainless steel pipe of type 304 the with a wall thickness of 26.9 mm and the outer diameter 406.4 mm is welded by manual arc welding process. Mechanical properties and fracture toughness of type 304 stainless steel are investigated in the temperature ranging from room temperature to — 162°C. The results obtained are summarized as follows. The tensile strength noticeably increases as the temperature becomes lower while the yield strength is relatively insensitive to temperature. The Charpy impact energy and CTOD values become higher in the case that crack propagation direction is aligned to the transverse axis upon the rolling direction than longitudinal direction. The drop of fracture toughness is associated with the noticeable diminution of plastic component as temperature seduces from room temperature to — 162°C.
16 citations
TL;DR: In this paper, an investigation was conducted to welds from SMAW, SAW and FCAW processes using matching filler metals to obtain a good understanding of the microstructural characteristics and properties of the T/P92 weld metals.
Abstract: The introduction of new power generation technologies, such as ultra super critical (USC) plant, has resulted in the development and application of a series of advanced Cr-Mo creep resistant steels. Among these new alloys, T/P92 steel has creep strength 25%-30% higher than the currently widely used T/P91 steel and it has become one of the major alloys for the construction of USC plant. In order to obtain a good understanding of the microstructural characteristics and properties of the T/P92 weld metals, investigation was conducted to welds from SMAW, SAW and FCAW processes using matching filler metals. The important phase transformation temperatures, Ac1, Ms and Mf, were measured. The mechanical properties at ambient temperature and creep properties of the weld metals were evaluated. Procedural factors that influence the performance of T/P92 weld metals were discussed and recommendations for suitable practical welding and post-weld heat treatment procedures were presented.
16 citations
TL;DR: In this paper, an experimental investigation in gas tungsten arc welding with the hydrogen addition to argon was made, where three base metals, i.e., low-alloy steel, high alloy stainless steel, and an aluminum alloy, using no filler material and in argon with the addition of 0.5-20% hydrogen.
Abstract: An experimental investigation in gas tungsten arc welding with the hydrogen addition to argon was made. The hydrogen addition to argon makes the arc constrict and the energy concentrate in the arc, which produces increase in arc power. Experimental welding was carried out on three base metals, i.e., low-alloy steel, high-alloy stainless steel, and an aluminum alloy, using no filler material and in argon with the addition of 0.5-20% hydrogen. In welding of stainless steel with the addition of 20% hydrogen to argon, the quantity of the base metal melted increases by three to five times, with the other parameters remaining the same, in welding of low-alloy steel by three times, and in welding of aluminum by six to nine times. The experimentally obtained results were compared with the theoretical ones. With both steels, the experimental and theoretical results agreed well, but with aluminum, they differed very much.
16 citations