Method for welding steel substrate layers of zirconium steel compound slabs

The invention discloses a method for welding steel substrate layers of zirconium steel compound slabs, which realizes fusion welding between steel substrate layers of the zirconium steel compound slabs by adopting automatic plasma welding for bottoming and welding the covered surfaces by automatic submerged arc welding under atmospheric environment. The method is convenient in operation, has highefficiency and low cost, and is free of limitation by surrounding environments and weld joint lengths; the welding efficiency in the method is improved by over 30% as compared with the traditional welding method; and the weld joint has beautiful appearance, and obviously reduced defects such as cracks, pores, included slag, incomplete fusion, lack of penetration and the like, excellent weld jointperformance, and respectively conforms to the requirements at the levels of JB/T4730.2-2005II, JB/T4730.5-2005I and JB/T4730.3-2005I by detection of 100% RT, 100% PT and 100% UT.