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 bonding ceramics and metal, or bonding similar ceramics among themselves; or bonding dissimilar ceramics

Abstract: A bonding method using, as bonding agent, brazing filler metal, or composite plating, or a combination of composite plating and ceramic spraying. In the first case, there are provided on the bonding region titanium powder and brazing filler metal alloyable with the titanium and having a lower melting point than titanium. The heating temperature is set higher than the melting point of the brazing filler metal but not so high to melt titanium. In the second case, the bonding region is coated with composite plating. Plating base material is made of metal alloyable with titanium and having a lower melting point than titanium. Titanium powder is diffused into the plating base material. The heating temperature is set higher than the melting point of the plating base material but not so high to melt titanium. In the last case, the bonding region is coated with the above composite plating, and further covered with ceramic spraying. The heating temperature is set in the same manner as the second case.

Microstructure/property relationships in dissimilar welds between duplex stainless steels and carbon steels

Abstract: The metallurgical characteristics, toughness and corrosion resistance of dissimilar welds between duplex stainless steel Alloy 2205 and carbon steel A36 have been evaluated. Both duplex stainless steel ER2209 and Ni-based Alloy 625 filler metals were used to join this combination using a multipass, gas tungsten arc welding (GTAW) process. Defect-free welds were made with each filler metal. The toughness of both the 625 and 2209 deposits were acceptable, regardless of heat input. A narrow martensitic region with high hardness was observed along the A36/2209 fusion boundary. A similar region was not observed in welds made with the 625 filler metal. The corrosion resistance of the welds made with 2209 filler metal improved with increasing heat input, probably due to higher levels of austenite and reduced chromium nitride precipitation. Welds made with 625 exhibited severe attack in the root pass, while the bulk of the weld was resistant. This investigation has shown that both filler metals can be used to join carbon steel to duplex stainless steels, but that special precautions may be necessary in corrosive environments.

Composite wire for gas shielded arc welding

Abstract: PURPOSE: To execute vertical up welding with high efficiency and to obtain the composite wire which has the good migratability of droplets and decreases the amt. of the spatters to be generated by specifying the grain size constitution, incorporating TiO 2 at a specific ratio into the wire and incorporating specific components at specific ratios therein. CONSTITUTION: A flux is filled in the sheath made of a steel. The grain size constitution is so specified that the particles having the grain size exceeding 149μ are incorporated into the wire at 10wt.% and the particles having 44μ grain size or below at ≤30wt.%. The TiO 2 is incorporated into the wire at 3.5W7.0wt.% of the total weight of the wire. Further, contains 0.4W1.0wt.% ZrO 2 , 0.1W1.0wt.% Al 2 O 3 , 0.3W1.0wt.% Si, 1.2W3.2wt.% Mn, 0.1W0.6wt.% Al, 0.03W0.3wt.% total of 1 or 2 kinds of Na, K:Na, K, and 0.01W0.2wt.% F. The vertical up welding is thereby executed with high efficiency and the amt. of the spatters to be generated is decreased; in addition, the working efficiency of welding is improved. COPYRIGHT: (C)1989,JPO&Japio

Method of making monolayer abrasive tools

Abstract: An improved method of making a monolayer abrasive tool using a relatively low melting point, soft filler metal alloy braze which possesses sufficiently high yield strength combined with a relatively high ductility and low elastic modulus to produce an exceptional bond between a monolayer of superabrasive particles and the tool substrate. The steps of the brazing process include applying a layer of the filler metal alloy including a an active metal in either pre-alloyed or as a mixture with the metal alloy and a monolayer of superabrasive crystals over the filler metal layer. This assembly is heated in a mon-oxidizing atmosphere such as a vacuum to melt the alloy and braze bond the superabrasive particles to the tool substrate. The alloy bond formed possess the properties of a ductility of at least 20 percent elongation, an elastic modulus of less than 15×10 6 or less, and a yield strength preferably at least about 45,000 to 50,000 psi. A copper/silver based alloy including about 8 to 15 weight percent indium and 1 to 4 weight percent titanium is used in a preferred embodiment of the method disclosed.