With the progress of science and technology

the welding of large structural parts has been greatly improved

but the welding of heavy load bases with high-quality welds and complex structures is still a big problem. Welding defects still accompany the entire welding process

and the quality of weld is difficult to meet the requirements of grade Ⅰ in QJ176B-2016"Technical requirements for fusion welding of land-based facilities"

and the long-term load use of the base has safety risks. For this problem

a certain product base is taken as an example

the welding method selection

welding process control

stress relief and other aspects are analyzed and researched

and a set of technological method that can improve the quality of weld and reduce the deformation is proposed. By using these methods

the welding of the base achieves remarkable results

and the qualification rate of radiographic inspection of grade Ⅰ weld reaches 90%. The successful use of this method in the heavy load base provides reference for the welding of large frame type structural parts with high weld quality requirements.