PWHT Smitweld TCS 1406 T/P P91 Weld thermal cycle simulation Weldability The paper presents application of weld thermal cycle simulator for investigations and data predictions after welding process and post weld heat treatment of base material. Along with basic description of thermal cycle simulator Smitweld TCS 1406 and influence of weld thermal cycle on mechanical properties and micro structure of base metal, the authors provided some practical data obtained on specimens after thermal simulation. This approach is often used for acceleration of weldability investigations combined with additional investigations (e.g. hardness and toughness determination, micro structure investigation, etc.) and other investigations (e.g. post weld heat treatment, casting, hot metal forming, etc.). With weld thermal cycle simulator it is possible to reduce duration and costs of production (e.g. investigations at PQR/WPAR, PWHT).

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This paper presents Taguchi optimization of bevel angle in plasma jet cutting process of aluminium alloy EN AW 5083. Experimentations for this paper were carried out on the basis of standard L27 Taguchi's orthogonal array in which three plasma jet cutting parameters such as cutting speed, arc current and cutting height were arranged at three levels. From the analysis of means, analysis of variance and two-way interactions plot, significant plasma jet cutting process parameters and optimal combination of their levels that lead to minimal bevel angle were identified. The results showed that all three process parameters significantly affect bevel angle response. The predicted response at optimal plasma jet cutting conditions has a good fit with result of bevel angle from observed experiment.

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