The obtained results contribute to a direct verification of the welding process and an automatic detection of possible imperfect welds. In addition, the process of adhesive displacement during the squeeze time and the initial welding current are discussed on the basis of the electrical energy generated in the component to be welded. The corresponding characteristics of electrical resistance will be recorded by using an online measurement device. The individual three-sheet steel stack-ups used are made of low carbon steel (DX51), HSLA-steel (HX340) and UHS-steel (22MnB5). In this manuscript, different sheet stack-ups are examined with regard to their weldability lobes and their process behavior. These characteristics can be analyzed by using an online measurement device. During welding, a specific characteristic of the electrical resistance is created for each individual material combination. For an asymmetric sheet stack-up, the electrical resistance for every faying surface is highly differentiated. Depending on squeeze time and electrode force the adhesive will be displaced. The effective weldability lobe is reduced and an adjusted preheat current is necessary to reconstitute the weldability of a component. Adhesive applications lead to a change in process behavior of resistance spot welding. In order to achieve these individual requirements, the use of three-sheet steel stack-ups with adhesive applications for car body construction is one of the current strategies used in automobile manufacturing. In addition to increasing torsional stiffness and crash safety of the body, the aim is also to reduce the overall weight at the same time. The body of a typical compact car design has a weight share of approx. * e-mail: to the increased demands for reducing CO 2 emissions, improving fuel efficiency of modern vehicles has been continuously monitored. Today most all of our stack projects have facilities requiring testing and/or CEMS and we have answers to questions on these requirements and how all of this can be integrated into your new stack project.Sascha Brechelt 1 *, Philipp Neef 1, Henning Wiche 1 and Volker Wesling 1 ,2Ĭlausthal University of Technology, Clausthal Centre of Material Technology, Leibnizstraße 9, 38678 Clausthal-Zellerfeld, GermanyĬlausthal University of Technology, Institute of Welding and Machining, Agricolastraße 2, 38678 Clausthal-Zellerfeld, Germany (A) Stack design, delivery and installation, (B) Stack testing emission and (C) Continuous emission monitoring services. We at ATI think all of this is significant and of value to our clients because no other one firm has the three experiences or capabilities. Of course, the answer again was “of course” and the CEMS division of ATI was begun. Norman if ATI could build a stationary CEMS system, like their mobile lab. And yes, similarly, a customer with an upcoming CEMS project again asked Mr. A few years earlier the ATI stack test team built a mobile monitoring lab (mobile CEMS system) by installing stack monitoring instruments in a trailer that could be towed to a plant site and parked by the process to test by using sample line from the process to the trailer. In the late 80’s, ATI expanded again into the stack monitoring business, much like they had with stacks by building their first stack stationary continuous emission monitoring system (CEMS). Nader has been an active member of the ASME Steel Stack Code Committee, since his employment with ATI and has served on a number of committees, as member, chair and assistant chair. The stack business continued to grow through the 90’s with the addition of turn-key services for stack installation and erection and the addition of Nader Zarrabi, as Chief Engineer. That first stack was for Shaw Industries, who to this day still remains a loyal client.
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