Dunno haven’t seen ur welds. Im always up for weld porn! My background is fabrication and sanitary welding wine lines. And even that was a few years ago. I’m a rail roader now. I have done old oil pans for motorcycles that were out of production cast aluminum and soaked in oil. Had to sweat them out. But personally. I try to back purge everything I can. And I don’t have a high freq welder at home and I doubt he does too. And that being the case it’s probably cheaper to source another one!