Effect of internal defects in steel on the quality of welded thick-walled equipment
The ultrasonic inspection of sheet steel showed the presence of internal defects whose origins were believed to be caused by the failure of the linear nonmetallic inclusions or of the boundaries between the inclusions and the metal with the formation of porosity. Tests were conducted with sulphur prints to determine the level of metal contamination with nonmetallic inclusions, and chemical nonhomgenity was discovered. It was concluded that the significant level of metal contamination with nonmetallic inclusions and the consequent low capability to deform in the thickness direction resulted in the formation of defects like stepped cracks and concentration cracks during the manufacture of the shells. Two methods to correct and repair the shells are introduced: deposition of metal by manual arc welding to fill the defective zones removed earlier, and replacement of a part of the shell or sheet. This technology ensures repairs of high quality.
- OSTI ID:
- 6974711
- Journal Information:
- Chem. Pet. Eng. (Engl. Transl.); (United States), Vol. 19:1-2; Other Information: Translation of Khimicheskoe i Neftyanoe Mashinostroenie (Feb 1983)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
STEELS
ARC WELDING
DEFECTS
ULTRASONIC TESTING
CONTAMINATION
CRACKS
INCLUSIONS
INSPECTION
MANUFACTURING
NONMETALS
POROSITY
REPAIR
SHEETS
SHELLS
SULFUR
TECHNOLOGY UTILIZATION
THICKNESS
ACOUSTIC TESTING
ALLOYS
DIMENSIONS
ELEMENTS
FABRICATION
IRON ALLOYS
IRON BASE ALLOYS
JOINING
MATERIALS TESTING
NONDESTRUCTIVE TESTING
TESTING
WELDING
360101* - Metals & Alloys- Preparation & Fabrication
420500 - Engineering- Materials Testing