AUTOMATIC WELDING AND CLADDING IN HEAVY FABRICATION

A description is given of the automatic welding processes used by an Italian fabricator of pressure vessels for petrochemical and nuclear plant. The automatic submerged arc welding, submerged arc strip cladding, pulsed TIG, hot wire TIG and MIG welding processes have proved satisfactory in terms of process reliability, metal deposition rate and cost effectiveness for low alloy and carbon steels. An example shows sequences required during automatic butt welding, including heat treatments. Factors which govern satisfactory automatic welding include automatic anti-drift rotator device, electrode guidance and bead programming system, the capability of single and dual head operation, flux recovery and slag removal systems, operator environment and controls, maintaining continuity of welding and automatic reverse side grinding. Automatic welding is used for: joining vessel sections; joining tubes to tubeplate; cladding of vessel rings and tubes, dished ends and extruded nozzles; nozzle to shell and butt welds, including narrow gap welding.

• Corporate Authors:

  Welding Institute

  Abingdon Hall
  Cambridge CB1 6AL,   England 
• Authors:
  • Altamer, A
• Publication Date: 1980-5

Media Info

• Pagination: p. 222-224
• Serial:
  • Metal Construction
  • Volume: 12
  • Issue Number: 5
  • Publisher: Welding Institute

Subject/Index Terms

• TRT Terms: Automatic welding; Butt welds; Defects; Inert gas shielded arc welding; Submerged arc welding; Welding; Welds
• Uncontrolled Terms: Weld defects
• Old TRIS Terms: Automatic welding systems; Butt welding; Inert gas welding; Welding techniques
• Subject Areas: Bridges and other structures; Marine Transportation;

Filing Info

• Accession Number: 00316645
• Record Type: Publication
• Files: TRIS
• Created Date: Sep 16 1980 12:00AM