... spot welding machine, except for electrode of welding gun, the working temperature of other touchable parts shall ... 3mm at the pressure of 0.6Mpa.5.4 Deflection of gun arm shall be less than 1:100 at ... 7.2 Test voltage 1700V, 50Hz applied between gun arms, gun arm to ring for 2 minute, it shall ... is not allowed.14. The material of welding gun: gun body made of Chromium Zirconium copper or brass, adopted ...