The basis of this method is in the utilization of the Joulean heat, which arises at the passage of current through connected sheets at collective influence of compressive force. It is applied in single‑part production, short‑run production as well as in mass production. Resistance Spot Welding of Steel Sheets of the Same and Different Thicknessĭirectory of Open Access Journals (Sweden)įull Text Available Resistance welding ranks among progressive and in practice often used manufacturing techniques of rigid joints. An improvement in quality has been observed for both the inclination due to the combined effect of multiple phenomena. Design of experiment has been used by implementing response surface methodology (RSM) to study the parametric dependence of cut quality, as well as to find out the optimum cut quality. Besides the absorption of laser radiation, beam inclination is also expected to influence the gas flow characteristics inside the kerf, shear force phenomena on the molten pool, laser beam coupling and laser power distribution at the inclined cut surface. The change in laser incidence angle has been incorporated by inclining the beam towards and away from the cut front, and the quality factors are taken as the ratio of kerf width and the striation depth. cutting speed and assist gas pressure on the cut quality of 4 mm thick steel sheet has been investigated. Therefore, the effect of laser incidence angle, along with other process parameters, viz. It has also been reported that fiber laser has an unfavourable angle of incidence during cutting of thick sections, resulting in poor absorption at the metal surface. This results in a more stable flow within the kerf for a longer depth, which improves the cut quality. However, the advarse effect of tight focusability can be taken care by shifting the focal point position towards the bottom surface of work-piece, which results in a wider kerf size. Better focasability results in narrower kerf-width, which leads to an earlier flow separation in the flow of assist gas within the kerf, resulting in uncontrolled material removal and poor cut quality. It has been however, reported that the higher focusability and shorter wavelength are advantageous for cutting thin metal sheets up to about 2 mm only. Mullick, Suvradip Agrawal, Arpit Kumar Nath, Ashish Kumarįiber laser has potential to outperform the more traditionally used CO2 lasers in sheet metal cutting applications due to its higher efficiency, better beam quality, reliability and ease of beam delivery through optical fiber. Moreover, the effect of the surface roughness tended to increase when decreasing the sheet thickness of specimens having the same roughnessĮffect of laser incidence angle on cut quality of 4 mm thick stainless steel sheet using fiber laser An FE simulation showed that both the surface roughness and thickness affected the flow-curve shape. The ductility also decreased when reducing the thickness. An analysis of the combined effects of the thickness and surface roughness revealed that the yield and tensile strengths decreased when the number of grains over the thickness was decreased. Tensile specimens of varying surface roughness were modeled and simulated. Additionally, the effect of surface roughness was determined by finite element (FE) calculations performed using FE code MARC 2007. In order to reduce the thickness of the specimens without changing the microstructure and grain size, chemical etching was carried out, resulting in Al sheets ranging from 0.40 mm to 1.58 mm in thickness. The effect of thickness on the mechanical properties of Al 6K21-T4 sheet specimens under uniaxial tension was investigated. Suh, Chang Hee Jung, Yun Chul Kim, Young Suk International Nuclear Information System (INIS) Effects of thickness and surface roughness on mechanical properties of aluminum sheets
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