| Improving Tensile Strength and Bend Ductility of Titanium/AISI 304L stainless Steel Friction Welds |
92 |
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| Authors:
A. Fuji; T. H. North; K. Ameyama; M. Futamata; TORONTO UNIV (ONTARIO)
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 | The strength and metallurgical properties of titanium/aisi 304L stainless steel friction welds were studied. Friction welds produced from high friction pressures and high upsetting pressures exhibited high tensile strength and failed within the titanium substrate. Welded samples failed at the Ti/steel interface, showing poor bend test ductility. Tensile strength of dissimilar welds was increased by decreasing the surface roughness. Residual strain was increased by increasing surface roughness. Reasons for poor ... |
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| Interlayer Selection and Thermal Stresses in Brazed Si3N4-Steel Joints |
91 |
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| Authors:
Y. Zhou; F. H. Bao; J. L. Ren; T. H. North; TORONTO UNIV (ONTARIO) DEPT OF METALLURGY AND MATERIALS SCIENCE
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| The influence of Cu, Kovar, Mo and W interlayers on the magnitude, distribution of thermal stresses and on the tensile strength of brazed Si3N4- steel joints is examined using finite element modeling (FEM) calculations and direct experiment. The FEM takes into account plastic flow and changes of mechanical properties of the interlayer, the steel substrate, and the filler metal as temperature decreases following the brazing operation. Joints made using low ... |
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| Effect of Oxygen on Hydrogen Cracking in High-Strength Weld Metal |
MAY 90 |
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| Authors:
K. Shinozaki; X. Wang; T. H. North
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| The effect of oxygen content on the susceptibility of high-strength weld metal to hydrogen cracking is examined. Increasing oxygen content had a detrimental effect on the cracking susceptibility of weld metal containing a diffusible hydrogen content of 4.7 ppm. In weld metal containing a much lower diffusible hydrogen content (0.87 ppm), increasing weld metal oxygen content had no detrimental effect on hydrogen cracking susceptibility. These results are explained by a ... |
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| microalloying additions and haz fracture toughness in hsla steels |
JAN 90 |
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| Authors:
g. r. wang; T. H. North; K. G. Leewis
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| the heat-affected zone (haz) fracture toughness properties of hsla steels remain the key when determining the structural integrity of major installations. although haz toughness has received considerable attention, there is a need for a systematic study of the influence of different combinations of microalloying elements (nb, v, ti) on haz fracture toughness properties. in particular, the study used laboratory-made steels of closely controlled chemistry, welded at a range of heat ... |
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| Hydrogen Cracking in High Strength Weld Metal |
90 |
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| Authors:
T. H. North; K. Shinozaki; X. Mao; H. Nakagawa; TORONTO UNIV (ONTARIO)
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| This paper examines the effect of weld metal oxygen content on the hydrogen cracking susceptibility of high strength weld metal at two diffusible hydrogen levels, 0.87 ppm and 4.7 ppm; increasing the oxygen content from 32 ppm to 675 ppm in weld metal containing a diffusible hydrogen content of 0.87 ppm had no effect on cracking sensitivity; however, in weld metal containing a diffusible hydrogen content of 4.7 ppm increasing ... |
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| Narrow Groove Twin-Wire GMAW of High-Strength Steel |
SEP 89 |
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| Authors:
E. Lassaline; B. Zajaczkowski; T. H. North
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| A new pulsed twin-wire GMA welding process was designed and tested in a narrow groove welding application. Arc blow problems (when two arcs operate in close proximity) were counteracted by phase shifting the peak current values of the master and slave power regulators in the power supply. Narrow groove twin- wire GMA welding of HY-100 and HSLA-100 plate materials produced joints with excellent mechanical properties. The weldability of HSLA-100 plate ... |
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| The Influence of External Local Heating in Preventing Cracking during Welding of Aluminum Alloy Sheet |
MAR 84 |
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| Authors:
I. E. Hernandez; T. H. North
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| This paper examines the effects of local heating of the base metal in preventing solidification cracking when welding H30 aluminum alloy sheet. External local heating was accomplished using a pair of oxyacetylene heating torches. These were arranged in such a way that they could be set at prescribed positions on either side of a GTA welding head and traversed the workpiece at the same speed as the GTA welding torch. ... |
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| Notch Toughness of Low Oxygen Content Submerged Arc Deposits |
DEC 79 |
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| Authors:
T. H. North; H. B. Bell; A. Koukabi; I. Craig
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| The use of Al, (RE), Mn, Si and Mg for deoxidizing welds below 220 ppm oxygen impairs notch toughness; Ti and V promote acicular ferrite microstructures and improve toughness in deposits with 200 ppm oxygen. |
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| Properties of Submerged Arc Deposits--Effects of Zirconium, Vanadium and Titanium/Boron |
DEC 79 |
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| Authors:
A. H. Koukabi; T. H. North; H. B. Bell
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| The production of low O content welds in conventional submerged arc welding can be achieved only by using low O potential fluxes and/or by adding deoxidants. In the latter case the role of the deoxidant element can have an influence on the microstructure and the toughness of the weld deposit. Such effects may be attributable to solution hardening (in the case of Al and Si) or to nitride and/or carbonitride ... |
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| SLAG/METAL INTERACTION, OXYGEN AND TOUGHNESS IN SUBMERGED ARC WELDING |
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| Authors:
T. H. North; H. B. Bell; A. Nowicki; I. Craig
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| fused fluxes containing 45% calcium fluorids 35% alumina and 20% calcium oxide yield less oxygen in the weld deposit than do agglomerated fluxes with the same constituents, and al additions to a 45% calcium fluoride 35% alumina 20% cao flux lower the oxygen contents of weld deposits to below that of the electrode while the addition of up to 1.2% al to the flux improves weld notch toughness. |
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Reports by Author
