pressure water tank: The outlet pipe adopted joints computerized automatic thermal welding technology using straight seam welded barrel body computerized automatic welding and Air pulse seam welding process, welding head with the barrel body with a large computer ring welding equipment welding,Large-scale machineary welding equipment does solve the serious problem od detruction of manual plate welding material .the welding process to ensure that no deformation of the workpiece, no corrosion, material does not changed, improve the products life, and the welding speed fast, good quality and high degree of automation, effective to reduce the cost of the product.