FIELD: metallurgy.
SUBSTANCE: performed are calibration, recrystallization annealing and preliminary machining of preset-size blanks of shells and rings. First strain hardening of shell blank is conducted at rotary drawing in several passes with intermediate recrystallization annealing while second one consists in quenching and tempering, rotary drawing and annealing to decrease the strain. Rotary drawing of conducted to get the shell bulged edges. Ring blanks are subjected to quenching, tempering and final machining to get the edges for ring welding of appropriate depth and length. After welding, produced welds are subjected to low-temperature tempering by HF currents.
EFFECT: high mechanical properties of welded shells, low residual inner strain, higher precision of geometrical sizes and strength of welds.
4 dwg, 1 ex
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