Topic
Filler metal
About: Filler metal is a research topic. Over the lifetime, 11152 publications have been published within this topic receiving 86590 citations.
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TL;DR: In this paper, the authors performed two experiments mainly to solve two problems: (1) analysis of output from TIG power source in hybrid welding state to prove experimentally the existence of direct current path which flows between TIG cathode and MIG anode via in hybrid arc plasma, and (2) measurement of actual heat input based on evaporation amount of liquid nitrogen to investigate detailed heat source property of this process.
Abstract: On TIG-MIG hybrid welding process (TIG: DCEN and MIG: DCEP), the stability of MIG arc can be kept even in pure inert shielding gas by the effect of hybridization with TIG arc, and it becomes possible to achieve the new welding method which has both merits of high quality as TIG welding process and high efficiency as MIG welding process. In this report, we performed two experiments mainly as follows to solve two problems: (1) Analysis of output from TIG power source in hybrid welding state to prove experimentally the existence of direct current path which flows between TIG cathode and MIG anode via in hybrid arc plasma. (2) Measurement of actual heat input based on evaporation amount of liquid nitrogen to investigate detailed heat source property of this process. As results, it was shown that output of TIG power source in hybrid welding condition is lower than it in single TIG welding, and the heat efficiency in hybrid welding condition decreases about 10 % rather than it in single heat source of TIG or MIG arc. Moreover, in specific condition that value of TIG current is lower than value of MIG current, output of TIG power source becomes entirely zero even though TIG arc shape is observed clearly, and thus, the stability of MIG arc is lost then. It can be said that these findings reveal the existence of direct current and explain one of mechanisms that TIG arc can control the arc stability and heat input of MIG arc.
38 citations
TL;DR: In this article, a comparative study on Incoloy 825 Ni-based alloy and SAF 2507 super duplex stainless steel dissimilar joints was conducted by optical microscopy, scanning electron microscopy equipped with an energy dispersive spectroscopy and X-ray diffraction.
38 citations
TL;DR: In this paper, the authors employed Focused Ion Beam- Digital Image Correlation (FIB-DIC) micro-ring-core technique for stress evaluation, and a sequentially coupled thermo-mechanical finite element model to assess the residual stress state near the weldment surface in the radial and hoop directions.
38 citations
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TL;DR: In this paper, a laser keyhole weld without filler metal is made in one pass, full penetration is achieved by two laser keyholes welds without filler material (one made from each side), or resistively heated filler wire is fed into the metal pool of a laser conduction weld in one or more passes along each side of the confronting surfaces to be joined.
Abstract: Virgin metal and metal alloy components are welded with and without filler material using a laser without cleaning the surfaces to be joined of mill scale and/or surface oxides, paints grease and other forms of contamination, and without edge preparation. The uncleaned, unprepared surfaces are placed in contact with each other, and a 100% through the thickness laser keyhole weld without filler metal is made in one pass, full penetration is achieved by two laser keyhole welds without filler metal (one made from each side), or resistively heated filler wire is fed into the metal pool of a laser conduction weld in one or more passes along each side of the confronting surfaces to be joined. Quality welds are made despite gaps of varying size up to about 0.125 inches between the parts to be joined.
38 citations
TL;DR: In this paper, the modern fiber laser beam welding of newly-designed precipitation-strengthened nickel-base superalloys using various welding parameters in constant heat input has been investigated.
Abstract: In the present research, the modern fiber laser beam welding of newly-designed precipitation-strengthened nickel-base superalloys using various welding parameters in constant heat input has been investigated. Five nickel-base superalloys with various Ti and Nb contents were designed and produced by Vacuum Induction Melting furnace. The fiber laser beam welding operations were performed in constant heat input (100 J mm−2) and different welding powers (400 and 1000 W) and velocities (40 and 100 mm s−1) using 6-axis anthropomorphic robot. The macro- and micro-structural features, weld defects, chemical composition and mechanical property of 3.2 mm weldments were assessed utilizing optical and scanning electron microscopes equipped with EDS analysis and microhardness tester. The results showed that welding with higher powers can create higher penetration-to-width ratios. The porosity formation was increased when the welding powers and velocities were increased. None of the welds displayed hot solidification and liquation cracks in 400 and 1000 W welding powers, but liquation phenomenon was observed in all the heat-affected zones. With increasing the Nb content of the superalloys the liquation length was increased. The changing of the welding power and velocity did not alter the hardness property of the welds. The hardness of welds decreased when the Ti content declined in the composition of superalloys. Finally, the 400 and 1000 W fiber laser powers with velocity of 40 and 100 m ms−1 have been offered for hot crack-free welding of the thin sheet of newly-designed precipitation-strengthened nickel-base superalloys.
38 citations