... -2001, ISO,GB,ASTM,BS,AISI,DIN,JISWelding TestingUltrasonic Testing, X-ray TestingManufacturing TechnologyDrilling, Cutting, Assembling, Welding, Rectification, Testing etcThe reason for ... qualityTimely service and progressProduction according welding rules a = 0.7 x thickness of webContinuous welding on both sides of each piecesMark ...