Effects of High Frequency Mechanical Impact on Fatigue Life of Semi-Automated Gas Metal Arc Welding (GTAW) of HSLA Butt WeldSalina Saidin, Dahia Andud, Yupiter H. P. Manurung, Muhd. Faiz Mat, Noridzwan Nordin and Martin LeitnerMATEC Web Conf., 269 (2019) 06002DOI: https://doi.org/10.1051/matecconf/201926906002