92) What is the operation to clean the cylinder valve before fixing the regulator to the argon cylinder?

93) What defect will occur in the weld metal if the arc voltage and travel speed is low in MIG / MAG welding?

94) What is the effect in MIG / MAG welding for a short stick out distance?

95) What is the weld defect if wire feed speed too high?

96) Which type of defect is caused if the gas flowing rate is uneven?