The Similar and Dissimilar TIG Welding of 316L and 321 Austenitic Stainless Steels

Year 2019, , 148 - 155, 31.12.2019

Özgür Çınar Mehmet Can Yaralı Ertan Erdemir Burcu Nilgün Çetiner , Ayhan Mergen Arif Nihat Güllüoğlu

https://doi.org/10.46740/alku.622016

Cited By: 2

Abstract

Being
one the modern high quality industrial welding process especially for stainless
steels and titanium alloys. TIG welding process has been has been researched
for decades in order to define its parameters such as welding speed, current
and arc length to improve the weld penetration. Hence it is a popular technique
for joining thin materials - the thickness of the work piece is in general
restricted to less than 6 mm-  in
manufacturing industries. In this study, AISI 321 and 316L stainless steel
sheets of 4 mm of thickness were used as welding metals. Thus, AISI 321 welding
metal couples, AISI 316L welding metal couples and AISI 321 and 316L welding
metal couples were selected to ensure a combination of similar and dissimilar
metals. The filler metal rod was made of 316L SS. The specimens were cut in
dimensions of 150 x 30 x 4 mm as using an abrasive cutter, then the V weld butt
joint configuration with single groove of 37.5o ± 2.5o groove angle by a lathe
machine. The welding current was 200 A and TIG welding process was performed
manually in single under argon shielding gas atmosphere. After TIG welding
process, the separate metallographic preparations, then microscopic and
macroscopic examinations of the specimens, also hardness measurements of
specimens were made. The rest of them was shaped for tensile strength
measurement using Instron Universal Testing Machine. The hardness of the
specimens were observed being altered in the range of 145-151 HRV(average) and
their tensile strength values in the scale of 345-400 MPa (average).

Keywords

AISI 321 and 316L Stainless Steels, TIG Welding

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