Welding Metallurgy of
01 Jan 1987-
About: The article was published on 1987-01-01 and is currently open access. It has received 991 citations till now. The article focuses on the topics: Welding.
Citations
More filters
TL;DR: Ni-Cr-Si-B alloy deposition on 304 ASS is executed by making use of automated processes like PTA, laser cladding, etc., which are supportive in the mass production as discussed by the authors.
Abstract: Ni–Cr–Si–B alloy deposition on 304 ASS is executed by making use of automated processes like PTA, laser cladding, etc., which are supportive in the mass production. However, for repairment and job-...
15 citations
TL;DR: The macrostructure and mechanical properties of clad metal produced by electric arc additive growth using wires of aluminum alloys of three alloying systems (Al- Si, Al- Mg-Si, and Al - Mg -Mg-Mn) are studied in this article.
Abstract: The macrostructure and mechanical properties of clad metal produced by electric arc additive growth using wires of aluminum alloys of three alloying systems (Al – Si, Al – Mg – Si, and Al – Mg – Mn) are studied. The distribution of the pores is assessed, the porosity and the microhardness are evaluated. The anisotropy of the mechanical properties determined in some specimens is explained.
15 citations
TL;DR: In this article, the defect structure in laser beam welds of the high-strength agehardened Al alloy (AlCu6Mn, EN AW-2219 T87) was studied using Doppler broadening spectroscopy (DBS) with unprecedented spatial resolution.
Abstract: We report on a newly developed scanning positron microbeam based on threefold moderation of positrons provided by the high intensity positron source NEPOMUC. For brightness enhancement a remoderation unit with a $100\,$nm thin Ni(100) foil and 9.6% efficiency is applied to reduce the area of the beam spot by a factor of 60. In this way, defect spectroscopy is enabled with a lateral resolution of $33\,\mu$m over a large scanning range of $19\times19\,$mm$^{2}$. Moreover, 2D defect imaging using Doppler broadening spectroscopy (DBS) is demonstrated to be performed within exceptional short measurement times of less than two minutes for an area of $1\times1$mm$^{2}$ ($100\times100\,\mu$m$^{2}$) with a resolution of $250\,\mu$m ($50\,\mu$m). We studied the defect structure in laser beam welds of the high-strength agehardened Al alloy (AlCu6Mn, EN AW-2219 T87) by applying (coincident) DBS with unprecedented spatial resolution. The visualization of the defect distribution revealed a sharp transition between the raw material and the welded zone as well as a very small heat affected zone. Vacancy-like defects and Cu rich precipitates are detected in the as-received material and, to a lesser extent, in the transition zone of the weld. Most notably, in the center of the weld vacancies without forming Cu-vacancy complexes, and the dissolution of the Cu atoms in the crystal lattice, i.e. formation of a supersaturated solution, could be clearly identified.
15 citations
01 Jan 2015
TL;DR: In this article, the effect of heat input in MMAW arc welding on cooling rate and hardness of weld joint is investigated, where the parameters that affect the heat input are welding current, arc voltage and welding speed.
Abstract: The effect of heat input in MMAW arc welding on cooling rate and hardness of weld joint is investigated in this paper. The parameter affects the heat input are welding current, arc voltage and welding speed. Mild steel weldments were welded under varying current 80, 90 and 100 ampere and keeping arc voltage and travel speed constant. Other mild steel specimens were welded under varying arc voltage 21V, 23V and 25V and keeping welding current and welding speed constant. Other mild steel specimens were welded by varying welding travel speed 1.52 mm/sec, 1.67 mm/sec and 1.82 mm/sec and keeping arc voltage and welding current constant. Heat input was calculated for each weldment. Rockwell hardness testing of all specimens was done. It was observed that with increase in arc current hardness of mild steel weld joint was increased up to optimum level and then decreased. Cooling rate was decreased with increased in arc current. With increase in welding arc voltage hardness of weld joint decreased and cooling rate was decreased also. With increase in welding travel speed hardness of weld joint increased and cooling rate was increased also. Keywords - MMAW, welding current, arc voltage, welding speed, cooling rate
15 citations
TL;DR: In this article, super-transus heat treatments on an additively manufactured body-centred-cubic β-Ti alloy led to the formation of equiaxed β grains from an initially columnar structure.
Abstract: Super-transus heat treatments conducted on an additively manufactured body-centred-cubic β-Ti alloy led to the formation of equiaxed β grains from an initially columnar structure. The grain...
15 citations
Cites background from "Welding Metallurgy of"
...The epitaxial growth of crystals during additivemanufacturing (AM)ofTi creates columns of bcc-structured prior β grains along < 100 > [1,2], leading to a significant anisotropy in mechanical properties [3–5]....
[...]
References
More filters
TL;DR: In this article, the state of the art in selective laser sintering/melting (SLS/SLM) processing of aluminium powders is reviewed from different perspectives, including powder metallurgy (P/M), pulsed electric current (PECS), and laser welding of aluminium alloys.
1,172 citations
TL;DR: In this article, the authors show that the pre-existing dislocation network, which maintains its configuration during the entire plastic deformation, is an ideal modulator that is able to slow down but not entirely block the dislocation motion.
557 citations
TL;DR: In this article, the fundamental understanding of structure-properties relationship in automotive steels resistance spot welds is discussed. And a brief review of friction stir spot welding, as an alternative to RSW, is also included.
Abstract: Spot welding, particularly resistance spot welding (RSW), is a critical joining process in automotive industry. The development of advanced high strength steels for applications in automotive industry is accompanied with a challenge to better understand the physical and mechanical metallurgy of these materials during RSW. The present paper critically reviews the fundamental understanding of structure–properties relationship in automotive steels resistance spot welds. The focus is on the metallurgical characteristics, hardness–microstructure correlation, interfacial to pullout failure mode transition and mechanical performance of steel resistance spot welds under quasi-static, fatigue and impact loading conditions. A brief review of friction stir spot welding, as an alternative to RSW, is also included.
369 citations
TL;DR: In this article, a unified equation to compute the energy density is proposed to compare works performed with distinct equipment and experimental conditions, covering the major process parameters: power, travel speed, heat source dimension, hatch distance, deposited layer thickness and material grain size.
369 citations
TL;DR: This study attempted to predict solidification defects by DNN regression with a small dataset that contains 487 data points and found that a pre-trained and fine-tuned DNN shows better generalization performance over shallow neural network, support vector machine, and DNN trained by conventional methods.
314 citations