ISO 9001 QUALTY MANAGEMENT STANDARD CERIFICATE ISO 14001:2004 ENVIRONMENTAL MANAGEMENT CERTIFICATION DIN EN ISO 3834-2 WELDING PRODUCTION EFFICIENCY CERTIFICATE OHSAS 18001:2007OCCUPATIONAL HEALTH AND SAFETY MANAGEMENT STANDARD CERTIFICATE GOST 23118-78 STEEL STRUCTURES STATE CERTIFICATE DIN 18800-7 WELD CERIFICATE DIN 18800-7 CLASS WELD CERTIFICATE MEMBERSHIP CERTIFICATE OF TURKISH STRUCTURAL STEEL ASSOCIATION (TUCSA) DIN 18800-7 CLASS WELD CERTIFICATE DIN 18800-7 CLASS WELD CERTIFICATE DIN EN ISO 3834-2 WELDING MANUFACTURING EFFICIENCY CERTIFICATE DIN EN ISO 3834-2 WELDING MANUFACTURING EFFICIENCY CERTIFICATE DIN EN ISO 3834-2 WELDING MANUFACTURING EFFICIENCY CERTIFICATE DIN EN ISO 3834-2 WELDING MANUFACTURING EFFICIENCY CERTIFICATE ASME CERTIFICATION OF AUTHORIZATION 'PP' #52,629 ASME CERTIFICATION OF AUTHORIZATION 'PP' #52,630 ASME CERTIFICATION OF AUTHORIZATION 'PP' #52,631