This longitudinal seam welder is an advanced automated welding system designed for high-precision welding of cylindrical or flat workpieces. It utilizes dual front and rear gas shielding, with the rear gas supply automatically staged to ensure consistent shielding. With its precise clamping system and smooth torch movement, the longitudinal seam welder delivers uniform, clean, and reliable welds, making it ideal for carbon steel, stainless steel, and alloy applications in pressure vessel, chemical equipment, and storage tank fabrication.