FIELD: preparation of tube ends for welding, namely dressing tube butts for diffusion welding.
SUBSTANCE: on edges of tube end of steel with less value of heat resistance tapered portions are formed. Between said tapered portions flat ring is formed. Mean line of flat ring is arranged lower than mean line of tube wall. Centering annular step is formed on end of tube made of steel with higher degree of heat resistance. It is possible to weld different type steels at keeping linear size of joined blanks.
EFFECT: enhanced quality of welded joints due to providing high stability of strength properties and coaxial position of welded tube blanks.
4 cl, 2 dwg, 1 ex
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|
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