Abstract Gas pool coupled activating TIG (GPCA-TIG) welding put forward in-house can dramatically enhance weld penetration of TIG welding through introducing active element oxygen to reverse the Marangoni convection flow in the molten pool. In order to further improve the welding productivity. the normal solid tungsten electrode is replaced by a kind of coupling arc electrode. The cha... https://darthomes.shop/product-category/shelf-clocks/