AUTO PPAW-HD series heavy duty pipe & elbow automatic welding machine suits for welding of heavy duty and thick-wall pipe, such as pipe & pipe, pipe & pipefitting(including flange, elbow, tee, reducer). For overcoming eccentricity of pipe fitting, this system is designed and equipped with peculiar compaction devices which can realize equality speed of workpiece. If matched with tailor-made pipe support, it can conveniently execute welding on joint of long straight pipe part. Application of this system can greatly improve welding automation, decrease labor intensity, and enhance welding quality and efficiency.