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: The formation of macrosegregation along the fusion boundary and degradation of weld quality is still not well understood as mentioned in this paper, but it is known that the filler metal in arc welding is different (dissimilar) in composition from the base metal.
Abstract: More often than not, the filler metal in arc welding is different (dissimilar) in composition from the base metal. It can cause macrosegregation along the fusion boundary and degrade the weld quality, but the formation of such macrosegregation is still not well understood. In the present study, the liquidus temperature of the weld metal T LW and that of the base metal T LB were considered, in addition to the stagnant or laminar-flow layer of liquid base metal along the weld pool boundary suggested by Savage. The following solidification concepts were presented: 1) The melting front is at T LB and not T LW ; 2) the solidification front is no longer isothermal at T LW everywhere - only the homogeneous bulk weld pool begins to solidify at T LW ; 3) the liquid base metal can freeze quickly in a different liquid cooler than T LB before much mixing occurs, so can the liquid weld metal freeze quickly in a different liquid cooler than T LW , and macrosegregation is promoted either way; and 4) complete mixing throughout the weld pool is impossible with T LW > T LB . Even when the filler metal is mixed completely with the bulk weld pool, macrosegregation can still occur by the following two mechanisms. In Mechanism 1, for filler metals making T LW T LB , the layer of liquid base metal is below T LW . The liquid weld metal pushed by convection from the bulk weld pool into this cooler layer can freeze quickly. Filler-deficient features, including "beaches," "peninsulas," and "islands," formed by Mechanism 1 are distinctly different from those formed by Mechanism 2. Macrosegregation reported by previous investigators can be explained by Mechanism 1, but macrosegregation by Mechanism 2 has not been reported. The mechanisms were verified with gas metal arc welds of 1100 Al (pure Al) made with filler 4145 Al (Al-4Cu-10Si) and of Cu made with filler ER-CuNi (Cu-30Ni).
30 citations
30 citations
TL;DR: In this article, a tool with cylindrical shoulder and a pin with different geometry was designed with four different geometries for friction stir welding of the dissimilar circular metal plates, which was carried out at welding speed varying from 10 to 40mm/min and tool rotational speed from 800 to 2000rpm.
30 citations
30 citations
TL;DR: In this article, the effect of brazing temperature and time on the interfacial microstructure and mechanical properties of a brazed joint was investigated, and fracture analysis indicated that cracks initiated at the interface of (Ti(Cu, Ni)2 + TiFe)/TiFe2, and then propagated along the zone of TiFe2 and α-(Fe, Cr + τ with cleavage and intergranular fracture pattern.
30 citations