The purpose of this study was to develop a high-efficiency and low-heat-input CO 2 arc-welding process using hot-wire feeding. A previous paper showed that the proposed hot-wire CO 2 arc-welding process has the potential to simultaneously achieve both high efficiency and low heat input. This paper investigated the production of a sound joint with only two welding passes on a butt joint of 20 mm-thick steel plates with no defects or unstable welding phenomena using the developed hot-wire CO 2 arc-welding process. Welding condition optimization was investigated using high-speed imaging and cross-sectional observations. The optimized conditions, which were the combinations of the welding current and hot-wire feeding speed as 350 A and 7.5 m/min, 400 A and 5 m/min, 450 A and 5 m/min, 500 A and 5 m/min, derived to avoid the presence of defects and molten metal precedence, which achieved sound welded joints possessing adequate properties of strength and toughness.
In this study, effect of machining parameters and wear mechanism in milling process of mold steel AISI-P20 and AISI-1050, using 10 mm twin flute type end mill diameter. The experimental results found that characteristics of milling surfaces and wear of the mill end were directly influenced by changes of parameters for all test conditions. As a result, the quality of milling surfaces also changed. However, mould steels which had the good quality surface is AISI-1050, with roughnesses of 2.120 μm. Quality milling surfaces were milled by using the most suitable parameter feed rate of 45 mm/min, a spindle speed of 637 rpm and a cut depth level of 3 mm, for both grades. Moreover, material removal rate and duration of the milling process, the milling end mills affect wear of the edge in every bite when the feed rate is low, high speed and level depth of cut at least. It was found that limited wear less will affect the surface roughness (Ra) represents the good quality surface.
The objective of this research is to study and compare quality milling surfaces, and the effects of plastic mould steels AISI-1050 and AISI-P20, in a milling process with various parameters based on experimental conditions, such as: 1) feed rates at 45, 50 and 55 mm/min, 2) spindle speeds of 510, 572 and 637 rpm, and 3) milling levels at 3, 5, and 10 mm, respectively, using a 10 mm twin flute ended type mill. The experimental results found that plastic mould steels which had the best quality milling surface were AISI-P20 and AISI-1050, with roughnesses of 2.627 μm and 2.120 μm, respectively. Quality milling surfaces were milled by using the most suitable parameter feed rate of 45 mm/min, a spindle speed of 637 rpm and a cut depth level of 3 mm, for both tested grades. However, characteristics of milling surfaces and wear of the mill end were directly influenced by changes of parameters for all test conditions. As a result, the quality of milling surfaces also changed.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.