Abstract
The wider implementation into automotive sector of new materials categorized as Advanced High Strength Steels (AHSS) in order to reduce costs and weight require the development of appropriate joining technologies. The paper presents the results of applying of a new hybid welding process, i.e. Pulsed LASER-(micro)TIG, for realizing overlap joints for Zn-coated AHSS materials. The statistical influence of main hybrid welding process parameters was investigated by means of factorial experimental design and weighted against the shear strength results of the realized joints. The influence of laser pulse peak power, the average welding TIG current and the joint gap was investigated for three types of Zn coated AHSS with different thicknesses. The results revealed that sane joints could be obtained with the new welding process and that the new process is fit to be applied for these materials. Each material did behave different in respect to the investigated process parameters and the results did reveal rather strong interaction between the influence factors (IF), however the joint gap does play an important role in respect to the maximum shear strength of the joint, which could be correlated to the specifics of the laser beam welding of Zn coated steels. The strong interaction between the studied IF imply further study of the new process by including other process parameters.
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