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Author: Publisher: ISBN: Category : Languages : en Pages : 136
Book Description
This report describes and presents results from tensile and fracture toughness tests conducted to determine whether undermatched welds (those made with weld consumables not matching the strength of the base plate) have lower joint efficiency and higher crack driving force because of increased strain concentration near weld metal flaws. Mismatched welds were fabricated by over-ageing 15-millimetre HSLA100 steel plate to four reduced yield strengths, and then using the same shielded-metal-arc welding consumable and procedure to make five welds with different degrees of under- and overmatch between -30% and +16% of yield strength but having the same weld metal toughness. Wide cross-weld tensile specimens were tested with and without reinforcement, and full thickness fracture toughness tests were performed at various sub-zero temperatures using nominal fatigue pre-crack/specimen width ratios of 0.17 and 0.5. The tensile tests indicated the tolerable level of ultimate strength undermatch for fracture outside the weld metal in the absence and presence of weld reinforcement. For the fracture toughness tests, two different sets of equations were used to calculate the crack driving force. Statistical analysis of the results was used to show effects of metal mismatch on measured weld metal fracture toughness.
Author: Publisher: ISBN: Category : Languages : en Pages : 136
Book Description
This report describes and presents results from tensile and fracture toughness tests conducted to determine whether undermatched welds (those made with weld consumables not matching the strength of the base plate) have lower joint efficiency and higher crack driving force because of increased strain concentration near weld metal flaws. Mismatched welds were fabricated by over-ageing 15-millimetre HSLA100 steel plate to four reduced yield strengths, and then using the same shielded-metal-arc welding consumable and procedure to make five welds with different degrees of under- and overmatch between -30% and +16% of yield strength but having the same weld metal toughness. Wide cross-weld tensile specimens were tested with and without reinforcement, and full thickness fracture toughness tests were performed at various sub-zero temperatures using nominal fatigue pre-crack/specimen width ratios of 0.17 and 0.5. The tensile tests indicated the tolerable level of ultimate strength undermatch for fracture outside the weld metal in the absence and presence of weld reinforcement. For the fracture toughness tests, two different sets of equations were used to calculate the crack driving force. Statistical analysis of the results was used to show effects of metal mismatch on measured weld metal fracture toughness.
Author: Publisher: ISBN: Category : Languages : en Pages : 37
Book Description
The main objective of this study was to assess the weld metal and heat-affected zone (HAZ) fracture behaviour for a series of submerged-arc welds produced in HY100 and HSLA100 steels. The toughness evaluation was carried out using one-inch thick dynamic tear fracture resistance specimens tested over a range of temperatures in order to establish weldment transition behaviour. The welds investigated were prepared using the same nominal energy input (2 kilojoules per millimetre) and included two submerged-arc narrow-gap welds and a conventional submerged-arc weld. Results presented include composition, mechanical properties, microstructure, and post-test metallography and fractographic analysis of the weld metal, as well as dynamic tear fracture resistance properties, microstructure, hardness, and post-test metallography and fractographic analysis of the HAZ.
Author: Kenneth D. Mickelberry Publisher: ISBN: Category : Languages : en Pages : 69
Book Description
A high strength low alloy steel, HSLA-100, is under development by the U.S. Navy. Instead of developing a new weld filler metal for this alloy it is desirable to use the already certified filler metals that are used for welding HY-100 steel. The research presented in this thesis evaluated the effect of cooling rate on the HY-100 welding consumable when used to weld HSLA-100 plate. The 800 C to 500 C cooling rate after gas metal arc welding was varied from 22 C/sec to 42 C/sec by using different plate thickness, different preheat and interpass temperatures as well as different heat inputs. Mechanical property data is reported elsewhere but summarized in this thesis.
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Author: Nikolas K. Kafetsis
Author: National Research Council
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Author: United States. Ship Structure Committee
Author: Kenneth D. Mickelberry
Author: John H. Underwood
Author: Herbert W. Mishler
Author: Robert Daniel Stout
Author: Zdravko Praunseis