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: In this article, the authors studied the repair of shallow cracks on the surface of 403SS steam turbine blades by infrared repair brazing using rapid thermal cycles, where a nickel-based braze alloy was used as filler metal.
Abstract: Martensitic stainless steel (403SS) is extensively used for intermediate and low-pressure steam turbine blades in fossil-fuel power plants. The purpose of this investigation is to study the repair of shallow cracks on the surface of 403SS steam turbine blades by infrared repair brazing using rapid thermal cycles. A nickel-based braze alloy (NICROBRAZ LM) is used as filler metal. The braze alloy after brazing is primarily comprised of borides and an FeNi3 matrix with different amounts of alloying elements, especially B and Si. As the brazing temperature increases, more Fe atoms are dissolved into the molten braze. Some boron atoms diffuse into the 403SS substrate primarily via grain boundary diffusion and form B-Cr-Fe intermetallic precipitates along the grain boundaries. The LM filler metal demonstrates better performance than 403SS in both microhardness and wear tests. It is also noted that specimens brazed in a vacuum have less porosity than those brazed in an Ar atmosphere. The shear strength of the joint is around 300 MPa except for specimens brazed in short time periods, e.g., 5 seconds in Ar flow and 30 seconds in vacuum. The fractographs mainly consist of brittle fractures and no ductile dimple fractures observed in the scanning electron microscope (SEM) examination.
36 citations
Patent•
08 Apr 1996TL;DR: In this article, stress corrosion cracking damage to stainless steels and nickel base superalloys is repaired by underwater plasma transferred arc welding under conditions which reduce residual tensile stresses in the weld and adjacent portions of the repaired structure.
Abstract: Stress corrosion cracking damage to stainless steels and nickel base superalloys is repaired by underwater plasma transferred arc welding which under conditions which reduce residual tensile stresses in the weld and adjacent portions of the repaired structure.
36 citations
01 Jan 2010
TL;DR: In this article, an overview of the fusion welding processes used in aluminium welding and further progress by analysing in detail the characteristics of laser welding of aluminium laser sources for welding are available for a few decades but new concepts are coming to the market The chapter addresses the most commonly used lasers for materials processing, CO2 and Nd-YAG (neodymium-yttrim aluminium garnet) and their interaction with aluminium alloys in welding applications.
Abstract: This chapter starts with an overview of the fusion welding processes used in aluminium welding and further progresses by analysing in detail the characteristics of laser welding of aluminium Laser sources for welding are available for a few decades but new concepts are coming to the market The chapter addresses the most commonly used lasers for materials processing, CO2 and Nd-YAG (neodymium–yttrim aluminium garnet) and their interaction with aluminium alloys in welding applications More recent laser types are also included, namely fibre lasers and disc lasers as, though only more recently available in the market, their potential is foreseen as being interesting for welding of aluminium Hybrid laser MAG (Metal Active Gas) welding has proven to lead to good results in welding aluminium plates namely for long seam welding
36 citations
TL;DR: In this paper, the effects of brazing temperature on the bonding ratio, shear strength and microstructure of the joints were studied, and the primary α-Al phase showed a refined spherical shape in the joint ultrasonically brazed at 440°C, but showed a coarse dendritic structure in the Joint Ultrasonic vibration was attributed to cavitation-aided grain refinement effects.
36 citations
TL;DR: In this article, a knowledge-base system was developed for identifying the most appropriate welding processes to suit specific circumstances, and nine important welding processes were used in the system to determine the best selection among competitive welding processes for high pressure vessel production.
36 citations