The 304 Stainless Steel lap joint flange welding process involves several steps to ensure a secure and durable weld. The first step is to clean and prepare the flange surfaces to ensure a smooth and clean area for welding. Next, the lap joint flange is placed onto the pipe and aligned, with the edges tacked into place. The inner bore of the flange is then welded to the pipe, followed by the outer circumference of the flange. Once complete, the weld should be inspected and cleaned to ensure it meets quality standards. This process should be repeated on the other side of the flange. It’s important to note that a qualified welder should perform the welding process, following appropriate techniques, using appropriate equipment, and considering safety measures, welding standards, and other relevant regulations.