国外的氩弧焊培训教材.pptVIP

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * Many blow holes. Welded spot gets blacked. 1) A cable for supplying a shield gas may not be connected firmly so that an air gets in a gas. 2) While it is not being used an air gets in a torch. Apply a gas for thirty seconds to remove an air from inside a torch before starting operation. 3) Argon gas may partially clogged in a torch. 4) Prevent a plastic workpiece from getting burned and spattered. 5) Design of a chuck (fixture) may not be appropriate. 6) Shielding gas pressure may get lowered due to branched piping. 7) Piping for argon gas may not be firmly done. 8) Degrease a workpiece. 9) Shielding gas may bounce back from walls of equipment and an air may get in a gas. 10) Weld time may be too short to remove dross. Check parameters. 11) Shielding gas may bounce back from chuck surface and an air may get in a gas. 12) Obstacles such as wind from a fan may prevent a shielding gas from applying appropriately. 13) Pre-purging time may be not enough. * ９. Safety * Noise: Prevent malfunction Arc noise propagates in the air. Do not place measuring devices and precision mechanical equipment close to the weld area. Automatic equipment may malfunction. Make sure of taking countermeasures against arc noise.　　　　　　　　　　　　　　　　　　　　　　　　　　　 Measures 1) Attach a noise filter or a noise-cut core to the signal cables. 2) Cover up the weld area with wire meshes. 3) Arrange the torch cable and the earth cable to stick parallel each other. 4) Do not place motors, switches and sensors around the torch. 5) Use the motor with anti-noise features. 6) Do not install this equipment close to other equipment. 7) Place insulation materials to keep more than 40mm between the torch holder and the wall of torch stand. 40cm 40cm Insulation Metal * 1) Those who use medical devices such as pacemakers should not come close to the equipment. 2) Do not hold the torch