Journal Article10.1007/S00170-016-8910-Z
Influence of cold-wire tandem submerged arc welding parameters on weld geometry and microhardness of microalloyed pipeline steels
TL;DR: In this paper, the effect of cold-wire addition parameters on dilution and the geometry and properties of the weld metal and the heat-affected zone (HAZ) is not well understood.
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Abstract: Tandem submerged arc welding with an additional cold-wire (CWTSAW) is being developed for pipeline manufacturing to improve productivity in terms of deposition rate and travel speed of welding. An appropriate understanding of the welding conditions to guarantee requisite weld geometry, appearance, and mechanical properties is always essential in the development of a welding process. Currently, the effect of the cold-wire addition parameters on dilution and the geometry and properties of the weld metal (WM) and the heat-affected zone (HAZ) is not well understood. In this work, heat input, voltage, and travel speed of both electrodes along with three main cold-wire parameters are investigated and correlated with the geometry of the weld and HAZ, i.e., aspect ratio (AR), semi-penetration ratio (SPR), reinforcement area (RA), and coarse-grained heat-affected zone (CGHAZ) area, dilution, and the microhardness of the WM and CGHAZ. The results showed that varying the cold-wire parameters significantly affects the dilution, AR, SPR, and microhardness. The addition of a cold-wire at a lagging position with a feed speed of 8.5 mm/s at 63° resulted in an overall improvement in the weld geometry, dilution, and microhardness. Cold-wire addition led to a reduction in the CGHAZ area, the amount of dilution, and the microhardness of the CGHAZ. Microstructural analysis, using both optical microscopy and scanning electron microscopy (SEM), indicated the formation of finer prior austenite grains (PAGs) and less martensite-austenite (M-A) constituent within the CGHAZ of the CWTSAW samples. The appropriate process parameters are defined to control the weld and HAZ geometry, dilution, and mechanical properties.
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Citations
Treatment of oil sands produced water using combined electrocoagulation and chemical coagulation techniques
TL;DR: It was found that all parameters except the electrode arrangement had a significant effect on the removal efficiency of the EC-CC process, and the chemical coagulant and the treatment time had the most significant contribution to the efficiency.
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Characterization of martensite-austenite constituents and micro-hardness in intercritical reheated and coarse-grained heat affected zones of API X70 HSLA steel
TL;DR: In this article, the influence of cold wire addition in conventional tandem submerged arc welding (TSAW+cold-wire) on the microstructure and micro-hardness in the coarse-grained heat affected zone (CGHAZ) and the intercritical reheated coarse grained heat-affected zone (ICRCGHAZ), respectively, was evaluated.
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Prediction and comparison of the dilution and heat affected zone in submerged arc welding (SAW) of low carbon alloy steel joints
TL;DR: In this paper, the effect of submerged arc welding (SAW) process parameters in 'purging' condition and has been compared to the traditional 'as weld' condition has been made.
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A Semi-Analytical Nonlinear Regression Approach for Weld Profile Prediction: A Case of Alternating Current Square Waveform Submerged Arc Welding of Heat Resistant Steel
Uttam Kumar Mohanty,Abhay Sharma,Mitsuyoshi Nakatani,Akikazu Kitagawa,Manabu Tanaka,Tetsuo Suga +5 more
TL;DR: In this article, the complexity in weld profile caused by abrupt change in polarity in square waveform welding is investigated through the development of a model capable of accurately predicting weld profile.
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Evaluation of cold wire addition effect on heat input and productivity of tandem submerged arc welding for low-carbon microalloyed steels
TL;DR: In this article, the influence of cold wire addition on the heat input, productivity and properties of an X70 microalloyed steel welded by tandem submerged arc welding (TSAW) is investigated.
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