METHOD TO RETARD FLAW DEVELOPMENT AND DEVICE TO THIS END Russian patent published in 2013 - IPC B23P6/04 F16L55/18 

FIELD: process engineering.

SUBSTANCE: invention relates to repair, particularly, to flaw development retardation. Pre-tension spring insert with lugs is fixed at locking frame. Then, said lugs are secured to part outside of said flaw zone to withdraw said locking frame. Note here that pre-tension of said spring insert makes ΔL to be defined by the formula: $$\Delta L=\beta \frac{{\displaystyle \underset{S_{def}}{\int }\sigma d{S}_{def}}}{{\displaystyle \sum _1^n{k}_i}}$$ where β is the factor equal to 1…1.5, σ is strain-in flawless zone, S_def is part defect zone area, k_i is factor of stiffness on i^th spring in spring insert, n is quantity of spring in said insert.

EFFECT: higher efficiency, decrease sizes.

9 cl, 15 dwg