No, it is not "the" way, it is only a way. Us on the other side of the pond more often use different standards, defined by ANSI. I wouldn't be surprised if other countries/continents had different standards for welding symbols (Russia, Japan, etc.), after all they do for technical drawings.
See this American Welding Society Weld Symbol Chart (PDF link): https://app.aws.org/mwf/attachments/64/ ... lchart.pdf
And https://www.millerwelds.com/resources/a ... ld-symbols