Filler metal

About: Filler metal is a research topic. Over the lifetime, 11152 publications have been published within this topic receiving 86590 citations.

Welding process effects in weldability testing of steels : Welding aluminium

Abstract: This work was part of a nationwide program for the development of new high-performance steels with 70 ksi (485 MPa) minimum yield strength, improved toughness, and lower manufacturing costs through the elimination of preheat for welding. The purpose of the present work was to evaluate the fusion zone hydrogen-induced cracking susceptibility of single-pass weld deposits made using four different welding processes at equivalent diffusible hydrogen levels. The gapped bead-on-plate test was used to compare shielded metal arc (SMAW), submerged arc (SAW), gas metal arc (GMAW), and flux cored arc (FCAW) welding processes. Equivalent net heat inputs were produced and the weld cross-sectional areas were normalized at different arc energies, including the heat transfer efficiency for each process. The minimum predicted preheats were different, lower for SAW than for GMAW, FCAW, and SMAW at similar diffusible hydrogen levels and heat inputs. This difference was attributed to the different solidification microstructures and weld bead geometries. Preheating guidelines based on the SMAW process remained the most conservative, confirming the validity of the past practice of using SMAW to find minimum preheats. It was concluded that preheat recommendations should not be extrapolated from one welding process to another. The information generated was used for manufacturing recommendations for welding high-performance steels.

Power source with fume extractor for welding

Abstract: A power source for welding includes electrical components that generate heat during a welding operation, a fume extractor for removing welding fumes from a welding site during a welding operation, and a filtration device for filtering the welding fumes to produce filtered air such that the filtered air helps cool the electrical components

Welding material for low coefficient of thermal expansion alloys

Abstract: The invention provides a welding material for welding iron containing low CTE alloys. The filler metal contains 25-55% nickel, 0-30% cobalt, 0.05-0.5% carbon, 0.25-5% niobium and balance iron with incidental impurities. The welding material also is operable with fluxes for submerged arc welding. In addition, the welding material may be configured to function as a flux coated or flux-cored electrode.

Pore formation during laser beam welding of die-cast magnesium alloy AM60B: Mechanism and remedy controlled remelting of the fusion zone led to removal of gas bubbles, reducing porosity

Abstract: Weld metal porosity is a major concern during laser beam welding of magnesium alloys. This study seeks to identify both the mechanism of pore formation and a remedy for this problem during continuous-wave Nd:YAG laser beam welding of die-cast magnesium alloy AM60B. Preexisting pores in the base metal coalesced and expanded during welding of this alloy and, as a result, large pores were commonly present in the weld metal. Unlike laser beam welding of aluminum alloys, the stability of the keyhole was not a major factor in pore formation during laser beam welding of alloy AM60B. The porosity in the fusion zone increased with the increase in heat input, i.e., increase in the laser power and decrease in the welding speed. It was found that well-controlled remelting of the fusion zone led to removal of gas bubbles and reduced porosity in the fusion zone.

Welding of Duplex Stainless Steel Composite Plate: Influence on Microstructural Development

Abstract: In the present study, the duplex stainless steel (DSS) composite plate (SAF2205/16MnR) was welded by shielded metal arc welding, and the appropriate joint design and welding procedure were carried out. After welding, the mechanical behaviors and microstructure of welded joint were analyzed by using SEM and TEM. Results show that the tensile strength of welded joint satisfied the requirement, and the plate-like γ-phase was uniformly distributed in α-Fe based solution matrix at interface between the DSS and weld metal, a carbon-rich layer and decarburized layer formed in carbon steel-weld metal interface due to migration of the element carbon. However, there were only α and γ phases in weld metal of the joint transition layer, which is advantageous to the properties of welded joint.