In order to improve the welding appearance and welding quality, manual DC pulsed Tungsten Inert Gas (TIG) welding is selected and tested on two materials without clearance. After relevant tests, the internal and external welds are well formed and free of defects. X-ray flaw detection result meets the requirement of specifications. The test results show that manual DC pulsed TIG welding can improve welding appearance on internal surface, reduce welding defects, and improve the welding quality. The production accuracy and productive efficiency can be improved by the TIG welding on two materials without assembly clearance. This welding method is popularized and achieves good results in ship building application.