Technology was developed for repair welding of damages in aircraft engine intermediate cases from magnesium alloy ML10. The technology comprises electrodynamic treatment of welds aimed at reducing the level of residual welding stresses. It was experimentally proved that treatment practically eliminates residual stresses in the weld. At charging voltage of up to 200 V electrodynamic treatment operator can perform maximum 1100 electrodynamic impact operations per shift, and at 500 V voltage - not more than 100 operations, that fully meets the requirements of production cycle of repair welding of aircraft intermediate case. The conclusions are: (1) Technology of repair welding of damage in aircraft engine intermediate case (AEIC) from magnesium alloy ML10 was developed, including electrodynamic treatment (EDT) of welds to lower the level of residual welding stresses. (2) By the results of EDT of full-scale AEIC fragments with characteristic damage of the item reconditioned by repair welding, it is established that EDT allows eliminating residual stresses in the weld. (3) Experimental procedure was developed, on the basis of which the influence of charging voltage on magnetic field intensity at EDT of welded joints of magnesium alloy ML10 was studied. (4) It is established that at up to 200 V charging voltage EDT operator can perform not more than 1100 actions of electrodynamic impact per a working shift, and at the voltage of 500 V - not more than 100, that supports the production cycle of repair welding of AEIC from magnesium alloy ML10.
Repair welding of intermediate cases of aircraft engines from high-temperature magnesium alloy ML10 with application of electrodynamic treatment
The Paton Welding Journal ; 11 ; 28-33
2012
6 Seiten, 6 Bilder, 2 Tabellen, 5 Quellen
Article (Journal)
English
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