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The ODS steel with oxide phase of good thermal stability and chemical stability can be used in fusion engineering to sustain high temperature and strong radiation.In fusion engineering structure,the welding process is essential.However,lots of micro porosity appears in the weld,and the tensile strength of the joint by traditional welding process is very poor.In order to obtain good welding joint of ODS steel MGH 956,the arc-ultrasonic TIG welding process is preferred in this study.