AWS 1 Soldadura 1 Welding 1 calificacin̤ 1 certificacin̤ 1 certification 1 conocimiento hơn ... educacin̤ 1 education 1 evaluacin̤ 1 evaluation 1 experience 1 experiencia 1 funciones 1 functions 1 ingenieros de soldaduras 1 knowledge 1 maintenance of qualification 1 mantenimiento de la calificacin̤ 1 norma 1 qualification 1 requirements 1 requisitos 1 soldadura 1 standard 1 welding 1 welding engineers 1 ít hơn ...