According to the welding method, welding can be divided into furnace, electric welding, gas welding and gas welding.Butt weld is divided into the form of the weld joint welding and butt welding.And butt welding forming way is divided into control and rolling two kinds.Welding machine control have a chain of equipment for furnace and continuous furnace two kinds of welding  machine.Using continuous roller rolling forming machine.

    Welding is divided into resistance welding, induction welding and arc welding.The resistance welding is divided into resistance welding and flash welding.It is also divided into electric arc welding arc welding, submerged arc welding and shielded arc welding Submerged arc welding is divided into straight seam and spiral seam two kinds.

    Gas welding is divided into acetylene welding and water gas welding.And water gas welding equipment is divided into roller pressure pipe welding machine forging type pipe welding machine.