двухсторонняя дуговая сварка под флюсом(generally used to describe pipe manufactured from rolled steel plate using a simultaneous internal and external submerged arc welding process to form the longitudinal seam)
двушовная дуговая сварка под флюсом(generally used to describe pipe manufactured from rolled steel plate using a simultaneous internal and external submerged arc welding process to form the longitudinal seam; DSAW)