Topic
Heat-affected zone
About: Heat-affected zone is a research topic. Over the lifetime, 18787 publications have been published within this topic receiving 231744 citations.
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TL;DR: In this article, the microstructure of the fusion zone and the heat affected zone is investigated in resistance spot welding of AISI 430 ferritic stainless steels and the phase transformations which occur during weld thermal cycle were analyzed in details, based on the physical metallurgy of welding of the ferritic steels.
92 citations
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TL;DR: In this paper, it has been found possible to derive relatonships giving peak temperatures and cooling (or heating) rates directly as functions of geometric, thermal and welding variables, and the expressions are close approximations, derived from the published temperature equations, demonstrably accurat to within 5% and are simple enough to be of engineering usefulness.
Abstract: It has been found possible to derive relatonships giving peak temperatures and cooling (or heating) rates directly as functions of geometric, thermal and welding variables. The expressions are close approximations, derived from the published temperature equations, demonstrably accurat to within 5%, and are simple enough to be of engineering usefulness. The most significant feature of the simplified equations is the clarity with which effects of changes in any welding, thermal or geometric variables can be predicted. Many resulte depend on whether the object being welded behaves like a thin sheet (two-dimensional heat flow) or a thick plate (three-dimensional heat flow), and this is readily determined. (auth)
92 citations
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TL;DR: Erve et al. as mentioned in this paper used finite element simulation to verify and validate the welding process on austenitic pipe welds and to make selective statements on improvements to the weld process, which can provide a starting point for a fracture mechanics safety analysis with acceptable computing times.
92 citations
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TL;DR: In this article, a split heat source model was developed to model the arc heat and the accuracy of the predicted cooling times, weld penetrations and lengths of the weld pools were compared with experimentally obtained values for bead-on-plate welds.
92 citations
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24 Apr 1989TL;DR: In this paper, a system for repairing worn surfaces of steam turbine components and especially high pressure turbine rotors is described, where a first layer of weld metal is applied on a worn surface of the component, whereby a heat-affected zone is created.
Abstract: System for repairing worn surfaces of steam turbine components and especially high pressure turbine rotors, are disclosed. These systems include depositing a first layer of weld metal on a worn surface of the component, whereby a heat-affected zone is created. A second layer of weld metal is then deposited over the first layer using a greater amount of heat to temper at least a portion of the heat-affected zone produced by the first layer. The preferred embodiments include the use of gas tungsten arc welding for providing fine-grain size and more creep resistance, especially in the weld and heat-affected zone. The resulting build-up can be machined, for example into a blade fastening to produce a component having properties equal to or better than the base-metal alloy. The invention also provides a longer lasting turbine system, including rotors which have serrated steeples that are more resistant to failure.
92 citations