Mechanical Characterization of dissimilar metal welding of SS 202 & SS 409 by NDYAG laser welding

Authors

  • M. Palanivendhan , J. Chandradass , Devansh Nagpal , Manas Tiwari

Abstract

— Laser welding being the non-conventional method for joining metals, and its main
advantageous are high heating/cooling rates, high spot diameter densitywhich results in a
minimum heat affected zone (HAZ). The study aimed at exploring the mechanical properties
of different grades of stainless steel SS202 and SS409. A solid-state,9.9 kWALPHA LASER
AL200 Nd: YAG laser was used. The experiments were carried out in austenite (SS 202) and
martensite (SS 409) stainless steel sheets. These metals were welded and studied the
properties at various parameters like laser power, pulse width and frequency, and keeping the
focal beam diameter as constant to achieve the optimum combination parameter.By using of
Minitab-19software analysis of variance (ANOVA) was carried out on the experimental data
to govern which process parameters were statistically significant. Taguchi design is used to
optimize the parameter. The mechanical characterization of the welded joints was carried out
by hardness test, bend test and tensile test. The effects of various operating parameters of
pulsed Nd: YAG laser welding of the dissimilar metals have been investigated. The results
yielded the definition of the best position for the incident laser beam with respect to the
position of welding, for welding the metals together.

Published

2020-10-16

Issue

Section

Articles