Showing papers in "Welding International in 1988"
TL;DR: In this paper, the authors present a new applied technology of plasma heat sources. But they do not discuss the application of this technology in the field of welding, only in the context of plasma cooling.
Abstract: (1990). New applied technology of plasma heat sources. Welding International: Vol. 4, No. 4, pp. 276-282.
44 citations
25 citations
13 citations
TL;DR: In this paper, a correlation between joint design and fatigue strength has been identified for simple lap joints, to provide designers with a useful tool allowing them to evaluate easily and quickly the improved fatigue strength obtainable by changing the number of weld spots.
Abstract: Resistance spot-welded joints are often the Achilles heel of structures subject to fatigue stresses. Although many papers, applying both numerical and experimental techniques, have been published in the last few years, the problem of correlation between joint design and fatigue strength has not yet been satisfactorily resolved. The aim of this article is to identify such a correlation for simple lap joints, to provide designers with a useful tool allowing them to evaluate easily and quickly the improved fatigue strength obtainable by changing the number of weld spots.
9 citations
9 citations
TL;DR: In this paper, the authors used Alloy 1 (Co-Cr-W-C) Alloy 4 (FeCr-Mo-V) Alloy 5 (Ni-CrB-Si) Alloy 6 (Fe-CrMo-Mn) Alloy 7 Alloy 8 Alloy 9 Alloy 10 Alloy 11 Alloy 12 Alloy 14 Alloy 15 Alloy 16 Alloy 17 Alloy 18 Alloy 19 Alloy 20 Alloy 21
Abstract: In the course of experimental research on hardfacing materials to be used as a substitute for Co-based alloys MMA, TIG and plasma transferred arc (PTA) welding processes were used for hardfacing 1, 2 and 3-layer specimens of Fe 52 and AISI 316L steels. The following filler metals were used: Alloy 1 (Co-Cr-W-C) Alloy 4 (Fe-Cr-Mo-V) Alloy 2 (Ni-Cr-B-Si) Alloy 5 (Ni-Cr-C-Mo) Alloy 3 (Ni-Cr-C-W) Alloy 6 (Fe-Cr-Mo-Mn) Testpieces were taken from the hardfaced specimens for the following tests: high temperature hardness, impact strength, sliding wear, abrasive wear; dilatometric analysis; corrosion tests; chemical analysis; and metallographic tests. The results show alloy 1 - chosen as the reference alloy - to have the best hardfacing properties and overall performance, and the existence of valid alternative alloys such as No. 5, 3 and 4, which nevertheless showed that they required greater care in the execution of the hardfacing.
7 citations
TL;DR: In this paper, the defects of flash-butt welded and kindred joints are discussed and the mechanisms of their formation, the effects which they have on the quality of the welded joint and the possible methods for their avoidance.
Abstract: The characteristic features of flash-butt welded and kindred joints and the defects which occur in them are reported. The mechanisms of their formation, the effects which they have on the quality of the welded joint and the possible methods for their avoidance are discussed.
7 citations
6 citations
TL;DR: In this paper, the authors present an approach for the welding of tantalum and niobium in the context of graphite and graphite-coated graphite materials, and present a detailed discussion.
Abstract: (1989). Welding of tantalum and niobium. Welding International: Vol. 3, No. 8, pp. 672-677.
6 citations
6 citations
TL;DR: In this paper, high speed welding of 0.5mm thickness alloy sheets using pulsed TIG welding is described. But this method is not suitable for high dimensional alloy sheets.
Abstract: (1988). High speed welding of 0.5mm thickness alloy sheets using pulsed TIG welding. Welding International: Vol. 2, No. 7, pp. 602-608.
TL;DR: In this article, the authors present an observation and digital control of the molten pool in pulsed MIG welding, and demonstrate that it can be controlled by an automatic control system.
Abstract: (1988). Observation and digital control of the molten pool in pulsed MIG welding. Welding International: Vol. 2, No. 3, pp. 234-240.
TL;DR: In this paper, the authors estimate the contact tip-workpiece distance in gas-shielded metal arc welding, and present an estimation of the distance between the tipworkpiece and the arc-welder.
Abstract: (1988). Estimation of contact tip-workpiece distance in gas shielded metal arc welding. Welding International: Vol. 2, No. 6, pp. 522-528.
TL;DR: In this paper, the authors evaluated the susceptibility of weld metal of SUS329J2L steel of which ferrite content was varied in the range of about 0 to 100% was evaluated by Trans-Varestraint cracking test.
Abstract: Solidification crack susceptibility in weld metal of SUS329J2L steel of which ferrite content was varied in the range of about 0 to 100% was evaluated by Trans-Varestraint cracking test. The susceptibility was partly confirmed by self-restraint cracking test. Microsegregation of such detrimental impurities as P and S was studied in relation to the susceptibility. Main conclusions obtained are as follows: (1) Solidification crack susceptibility was minimum at ferrite level from 5 to 20%, and high not only near full austenite region but also in the level more than 40% ferrite region. (2) The cause of this tendency was inferred from the dependency of the microsegregation behavior of S and P on the ferrite content. That seemed to be because the degree of such interdendritic microsegregation is enhanced in high ferrite level compared with 5 to 20% ferrite level, (3) It was shown that such microsegregation behaivor resulted in making the solidification temperature range wider.
TL;DR: In this article, the effect of dynamic characteristics of SCR arc welding rectifiers on spatter have been made using microcomputer experimental and data analysing systems Statistical data derived from welding tests show that there is a qualitative relationship between arc welding spatter and the dynamic criterion Ihd/Ih, i.e., ratio of overshoot current to load current on the load/short circuit transition of welders.
Abstract: In this paper, quantitative analyses regarding the effect of dynamic characteristics of SCR arc welding rectifiers on spatter have been made using microcomputer experimental and data analysing systems Statistical data derived from welding tests show that there is a qualitative relationship between arc welding spatter and the dynamic criterion Ihd/Ih, ie the ratio of overshoot current to load current on the load/short circuit transition of welders Further studies with high speed photography and synchronous measurement of welding current revealed that the said relationship is caused mainly by the influence of the dynamic behaviour of the rectifier on the transient current value at the moment when the short circuit transfer is over When the value of the Ihd/Ih is over 20, the current output from the rectifier necessary to restrike the arc at that moment is so large that the molten pool is strongly impacted so causing spatter
TL;DR: In this paper, the effect of brazing temperature and time on the joint properties of Ti-6Al-4V alloy brazed with Ag-5Al-0.5Mn filler metal was summarized.
Abstract: This paper summarized the effect of brazing temperature and time on the joint properties of Ti-6Al-4V alloy brazed with Ag-5Al-0.5Mn filler metal. The brazing was performed in a resistance heating type vacuum furnace. The brazing temperatures and times were ranging from 1143 K to 1203 K and from 0 to 30 minites respectively. Microscopic, EPMA, and X-ray diffraction analysis were carried out to investigate the microstructure of the brazed joints. Tensile tests of brazed joints were performed on each brazing condition.The obtained results were summarized as follows:(1) Silver and aluminum diffused into the base metal and some types of intermetallic compounds were formed at the brazing interfaces. The thickness of reaction layer increased with increasing brazing temperature and brazing time.(2) Brazing at 1173 K for 10 min gave the maximum tensile strength of brazed joint.
TL;DR: In this paper, Fatigue crack propagation in welded joints was studied and showed that fatigue cracks propagate with the number of joints in a welded joint and not with the length of the joints.
Abstract: (1988). Fatigue crack propagation in welded joints. Welding International: Vol. 2, No. 7, pp. 609-612.
TL;DR: In this article, the effect of resistance spot welding conditions on the distribution of residual stresses was investigated and it was shown that the residual stresses in resistence spot welding are positively associated with residual stresses.
Abstract: (1988). Effect of resistance spot welding conditions on the distribution of residual stresses. Welding International: Vol. 2, No. 12, pp. 1058-1061.
TL;DR: In this article, the appearance of fracture and impact toughness of weld metal alloyed with yttrium was investigated and the results showed that the weld metal was fracture-tolerant and impact-tough.
Abstract: (1988). Appearance of fracture and impact toughness of weld metal alloyed with yttrium. Welding International: Vol. 2, No. 1, pp. 40-41.