is a self-propelled submerged arc welding system applicable for bottom-up and Top-down constructed wall storage tanks. This type Of machine can serve both construction methods. The large tank, metallurgical blast furnace and hot stove which have the large steel construction are made of plate, the joint form of main structure mostly is long ld. The construction project is huge, but itâs especially fit for automatic welding. Conventional automatic welding technique hardly achieves the high efficient welding. Automatic submerged arc weld of transverse seam machine is designed for the transverse level ld and girth weld, and it is especially suitable for level weld of cylindrical steel structure. Using combined with vertical position gas-electric welding machine, it is the ideal equipment of automatic welding of large steel structure such as oil tank and blast furnace.