Abstract: Combined with the actual production,through the welding test of BS700 high-strength steel specimen and the welding practice of BS700 high-strength steel boom,the paper expounds the welding process,weld appearance inspection,ultrasonic flaw detection,mechanical property detection,welding deformation control and post-welding quality inspection of BS700 high-strength steel boom welding production.A welding process method of BS700 high strength steel boom is provided,which provides a reference for the process practice of similar products.