Filler metal

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

Method of butt welding

Abstract: A method of welding using a high energy density radiation beam for butt welding a pair of sheets while minimizing and preferably eliminating edge preparation required before welding and the use of filler metal during welding. In preparation for welding, the sheets are placed with edges facing each other in a butt-joint arrangement. To minimize and preferably eliminate edge preparation, surface mismatch is introduced between the sheets with a portion of the edge of the mismatched sheet being above the weld interface of the sheets and preferably exposed to the beam during welding. To further assist flow of molten metal from the mismatched sheet into the weld interface region, the sheets are preferably angled from the horizontal such that the weld interface plane is acutely angled relative to the direction of gravity so that flow of molten sheet material is influenced by gravity. Preferably, the sheets can also be inclined relative to the horizontal plane such that the weld line between the sheets is at least slightly downwardly sloped in the direction of welding so that the molten weld nugget in the weld interface region is influenced by the direction of gravity for suitably minimizing concavities and other weld defects in the resultant butt weld. If desired, the sheets can be angled both in a direction transverse and tangent to the welding direction. After welding is completed, the sheets preferably form a blank that can be shaped, formed, or otherwise three dimensionally contoured.

Element distribution in lean duplex stainless steel welds

Abstract: Segregation of alloying elements and nitrogen loss may have a negative effect on the corrosion resistance of autogenously welded duplex stainless steel. The lean duplex LDX 2101® (EN 1.4162, UNS S32101) has less metal element segregation and improved austenite formation compared to other duplex grades and addition of filler metal is not always necessary to achieve good corrosion properties. In gas tungsten arc welding, nitrogen additions to the shielding gas can counteract nitrogen loss and thereby contribute to achievement of the required phase balance. The element distribution in S32101 welds performed autogenously bead-on-plate with and without nitrogen additions to the shielding gas has been quantified and illustrated with electron probe microanalysis mapping. Local segregation and depletion along the fusion line have been elucidated and explained in terms of epitaxial growth and dendritic solidification behavior. The resulting variations in the corrosion resistance are demonstrated by the pitting resistance equivalent distribution and compared to previously known corrosion data.

Evaluation on microstructure and mechanical properties of high-strength low-alloy steel joints with oscillating arc narrow gap GMA welding

Abstract: with the purpose of improving weld joint quality and productivity, the oscillating arc narrow gap gas metal arc (GMA) welding was employed in welding quenched and tempered high-strength low-alloy thick steel. The microstructure and mechanical properties of weld joints were evaluated, namely micro-hardness, tensile strength, and low-temperature impact toughness. The test results indicated that mechanical properties of weld joints with oscillating arc narrow gap GMA welding were excellent and found to meet stipulated requirements. Oscillating arc narrow gap GMA welding is a promising process for welding quenched and tempered HSLA thick steels due to the low energy input and narrow square-butt groove.