The influence of alternating shielding gas on fusion characteristics and weld metal characteristics was examined using a solid wire electrode on SA515Gr 70 carbon steel (ER70S). To improve the efficiency of the traditional GMAW process. two shielding gases of Argon and CO _2 were supplied independently to the GMAW torch using a gas alternator unit with a predetermined frequency to the... https://macorners.shop/product-category/acrylic-keychain-custom-charms/