The welding process for spiral plate heat exchangers has certain technical requirements. This welding process is universal for spiral plate heat exchangers, and the construction process must be strictly followed according to the equipment construction drawings, including intermediate inspection and final acceptance. When welding a spiral plate heat exchanger, welders are required to work with valid certificates. After welding is completed, the welder should stamp their welder number near the weld seam. Relevant personnel should keep detailed construction records and archive them properly. If the construction drawings do not specify relevant regulations, the weld seam's overlap height should be around 1mm. For fillet welds, the height of the weld leg should match the thinner workpiece wall in the connecting piece. The steel plate material used to roll the spiral plate must have uniform thickness and consistent width. If the width is not consistent, both ends of the rolled spiral plate should be ground to match, so as not to affect the welding quality. Adequate preparation should be made before welding. For stainless steel weldments, debris and oxides at a distance of 10mm from both sides of the groove should be ground off, and measures to prevent splashes should be taken. Before welding, the welding electrodes should be treated according to the welding instructions, and the electrodes should be dried. Welders who receive and use welding electrodes should carry an insulated bucket. When connecting round steel with electric welding, symmetric electric welding should be used, and the quality of the electric welding of round steel should be 100% inspected. If any solder skips or burnthrough is found, it should be promptly repaired, and welding deformation should be strictly controlled. Welding should be carried out from the center of the spiral plate outwards. The welded seam and areas affected by high temperatures should be free of porosity, cracks, and slag inclusions