... , gun arm to ring for 2 minute, it shall have no flashover and breakdown.8. The stiffness and strength of electrode arm ... : click type pushbutton, the pushbutton shall be operated agilely, the function shall be reliable, during its continuous pushing, the block shall ... grinded, coating is not allowed.14. The material of welding gun: gun body made of Chromium Zirconium copper or brass, adopted high ...