Filler metal

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

Plasma Arc Welding of Modified 12%Cr Stainless Steel

Abstract: This article deals with the plasma arc welding properties of 6 mm thick modified X2CrNi12 stainless steel conforming to the grades EN 1.4003 and UNS S 41003 with carbon content below 0.015% to improve the weldability. The butt welds produced without filler metal and with AISI 316L austenitic type of consumable were subjected to tensile and bend tests as well as Charpy impact toughness testing. Examinations including fractography, metallography, chemical analysis of the weld metal, ferrite content, grain size, and hardness analyses were carried out. Sound plasma arc welded joints of modified 12 Cr revealed the microstructure-property relationship, such as high ferrite content (≥ 70%) resulting in ferrite grain coarsening mainly at the high temperature heat-affected zone (HTHAZ) has no adverse effect on tensile or bend properties, but has negative effects on low temperature toughness. Enhanced toughness was provided in case of the low temperature heat affected zone (LTHAZ) with finer grained microstructure....

Thermally assisted ultrasonic welding apparatus and process

Abstract: Method and apparatus are provided for use in an ultrasonic vibratory welder for pre-heating the workpieces prior to welding and, thereafter, for continuously monitoring the temperature of the anvil and of the welding tip during subsequent welding operations to insure their temperature remains within a pre-determined range during the entire welding cycle. It has been found that weld characteristics, particularly weld size, shape, configuration and strength are dependent upon the temperature of the anvil and welding tip. Thermostatically controlled resistance heating means are provided in the anvil and/or in the welding tip for pre-heating of the workpieces. Automatic control means, are also provided for alternately heating and cooling the anvil and welding tip during the welding cycle.

Resistance welding method of different kinds of materials, and resistance welding member of aluminum alloy material and different kind of material

Abstract: The resistance welding method of different kinds of materials is the method for welding an iron material and an aluminum alloy material, and comprises the steps of: performing in advance a coating treatment at least to a portion of the aluminum alloy material, where resistance welding is performed, with any of iron and iron-base alloy and forming a surface layer; and performing resistance welding of the iron material and the aluminum alloy material through the surface layer, and the resistance welding may be any of spot welding and projection welding.

Wetting behaviour of Zn–Al filler metal on a stainless steel substrate

Abstract: This work offers an analysis of the wetting behaviour of the Zn–xAl filler metal spreading on the stainless steel. Effects of Al content on wetting kinetics and microstructures of the re-solidified filler metal were studied in this important system of dissimilar substrates. Experimental results have confirmed that the wetting of Zn–xAl filler metal on stainless steel features the trend of triple-line kinetics. In the main spreading phase, the spreading radius and time can be correlated with a power law of Rn ∼ t, n = ∼0.4. The content of Al in the filler metal has a minimal effect on the value of n for the investigated range of Al concentrations. However, the spreading area of the filler metal after re-solidification decreases with an increase of the content of Al. Moreover, the thickness of the Fe–Al intermetallic layer at the cross-section increases with an increasing Al content.

Brazing of Inconel X-750 to stainless steel 304 using induction process

Abstract: The proposed paper discusses results of the joining of Inconel X-750 to stainless steel 304 by induction brazing. The experimental brazing was carried out at 1423 K using a nickel-based brazing BNi-2 (Ni–7Cr–3Fe–3.2B–4.5Si–0.06C wt.%) filler metal. By means of induction heating, joining process can be completed within seconds in argon ambient. The effects of joining time on the microstructures of joint and base materials, elemental distribution within the brazed joint, and the joint shear strengths were investigated. Experimental results show that BNi-2 containing boron and silicon melting point depressants can achieve good wetting and spreading between Inconel X-750 and stainless steel 304. Joint shear strengths of as high as 483 MPa were obtained when processed at approximately 1423 K for 180 s. The width of the braze-affected zone increases with increasing joining time but it does not cause any significant reduction in the joint strength. Inconel X-750 and stainless steel 304 exhibited no noticeable change in their microstructures due to the rapid heating cycle of induction processing.