Filler metal

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

A comparative study of laser beam welding and laser–MIG hybrid welding of Ti–Al–Zr–Fe titanium alloy

Abstract: Ti–Al–Zr–Fe titanium alloy sheets with thickness of 4 mm were welded using laser beam welding (LBW) and laser-MIG hybrid welding (LAMIG) methods. To investigate the influence of the methods difference on the joint properties, optical microscope observation, microhardness measurement and mechanical tests were conducted. Experimental results show that the sheets can be welded at a high speed of 1.8 m/min and power of 8 kW, with no defects such as, surface oxidation, porosity, cracks and lack of penetration in the welding seam. In addition, all tensile test specimens fractured at the parent metal. Compared with the LBW, the LAMIG welding method can produce joints with higher ductility, due to the improvement of seam formation and lower microhardness by employing a low strength TA-10 welding wire. It can be concluded that LAMIG is much more feasible for welding the Ti–Al–Zr–Fe titanium alloy sheets.

An investigation of ductility-dip cracking in nickel-based weld metals - Part III

Abstract: In Part I of this investigation of ductility-dip cracking (DDC) in nickel-based filler materials, the strain-to-fracture (STF) test (Ref. 1) was used to quantify the DDC susceptibility of two Ni-based filler metals, Filler Metal 52 and Filler Metal 82. Ductility-dip cracking susceptibility was related to the nature of the migrated grain boundaries in these weld metal deposits and the effect of grain boundary tortuosity on the mechanical locking of these boundaries at elevated temperature. Part II of this investigation used scanning electron microscopy to examine the DDC fracture surfaces in order to relate fracture mode to temperature, composition, interstitial content (hydrogen), and microstructure. Part III of this investigation uses optical microscopy, high-resolution scanning electron microscopy, and electron backscattered diffraction (EBSD) techniques to further explore the factors that contribute to DDC in Ni-based weld metals. Based on this analysis and the results from Parts I and 11 of this investigation, a DDC mechanism is described that involves the complex interplay of alloy composition, interstitial and impurity element additions, grain boundary segregation, triple-point grain boundary junctions, grain growth, grain boundary sliding, precipitation, recrystallization, boundary orientation relative to the applied strain, and the contribution of grain boundary misorientation and accumulated local strain. Insight is provided to optimize elevated-temperature ductility in order to avoid DDC in Ni-hased weld deposits and other austenitic alloys.

Fundamentals of welding metallurgy

Abstract: Metallurgical presentation of the general welding processes and characteristics of the welding operation Thermal and thermochemical study of welding Introduction to the metallographical examination of welds Formation of the fusion zone Solidification of the weld metal Solid phase transformations during welding (heating) Solid phase transformations during welding (cooling) Hardening and cold cracking in steel welding Heat treatments for steel welds Metallurgical aspects of destructive and non-destructive weld tests.