Internal welding is carried out by extending the welding machine arm into the interior of the steel pipe at a distance behind the engagement point where the steel strip is formed. Both internal and external welding adopt the automatic single-wire submerged arc welding method with direct current reverse polarity.
Related Knowledge
-
86. What impact does pre-treatment have on the adhesion of the galvanized layer?18 Mar, 2026 -
85. What is the effect of molten zinc temperature on zinc slag? At what iron content in molten zi...18 Mar, 2026 -
84. How does zinc slag affect the galvanized coating of galvanized steel pipes?16 Mar, 2026 -
83. How is zinc slag formed? What are its components?16 Mar, 2026