Keywords: Welding; Welded joints; Pipes; Pipelines ; Metals; Steels; Approval testing; Acceptance (approval); Quality assurance systems; Quality assurance; Field testing; Butt joints; Submerged arc welding; Underwater technology; Test specimens; Testing conditions; Performance testing ; Performance; Visual inspection (testing); Grades (quality); Defects; Classification systems; Non-destructive testing; Tensile testing; Impact testing; Hardness testing; Chemical composition; Chemical analysis and testing; Determination of content ; Dimensional measurement; Thickness; Records (documents); Repair; Reports; Certificates of conformity; Arc welding; Fusion welding; Metal-arc welding; Gas-shielded welding; Gas metal-arc welding; Gas tungsten-arc welding