The recent research status of welding porosity of die-casting magnesium alloy was reviewed,including the gas sources,formation mechanism,influencing factors and prevention measures of welding porosity,and the high gas contents in base metals was considered as the major factor of influencing porosity formation tendency by analyzing.Because of the high original gas content of die-casting magnesium alloy,the traditional measures of prevention and control of porosity play a very limited role,and metallurgical m...