CN105345387A - Repair method for oil leakage of process pin hole in nozzle installation seat of auxiliary oil path of engine fuel tube - Google Patents

Abstract

The invention discloses a repair method for oil leakage of a process pin hole in a nozzle installation seat of an auxiliary oil path of an engine fuel tube. The repair method comprises the following steps: marking the oil leakage part of the process pin hole in the nozzle installation seat of the auxiliary oil path of the engine fuel tube before welding, and then polishing by virtue of an air drill and a grinding wheel to generate a metal lustre on a welding surface; then heating and melting the leakage part by virtue of an argon arc welding gun, without adding welding wires, and after a gas is completely discharged from the leakage part, rapidly adding the welding wires and welding; then carrying out a dye check on the repair welding part, and avoiding cracks; and then carrying out a seal test, checking the repair welding part, and avoiding leakage. According to the repair method, the gas generated with heat is eliminated from the leakage part of the process pin hole of the installation seat and then the welding wires are added for welding, so that the welding quality is ensured, the technical problem that the oil leakage fault of the process pin hole of the installation seat cannot be effectively eliminated by conventional argon arc welding is solved, the rejection rate of parts is reduced, and the maintenance period is shortened.

Description

The restorative procedure of engine fuel pipe nozzle auxiliary oil circuit mount pad technique pin-and-hole leakage of oil

Technical field

The present invention relates to aero-engine manufacturing technology, the restorative procedure of particularly a kind of aero-engine fuel pipe nozzle auxiliary oil circuit mount pad technique pin-and-hole leakage of oil.

Background technology

Aero-engine fuel pipe is used for engine chamber conveying fuel oil, and fuel oil mixes in burner inner liner with high-voltage high-speed air, and tissue burning.Fuel pipe oil transportation circle is divided into major and minor oil transportation circle, and oil transportation circle is distributed with the mount pad of some swirl atomizers.When carrying out leakage test, often find that there is oil leakage phenomenon at fuel pipe nozzle auxiliary oil circuit mount pad technique pin-and-hole place.

Can be learnt by the structure (as shown in Figure 1) of fuel pipe mount pad, the reason of fuel pipe nozzle auxiliary oil circuit mount pad technique pin-and-hole leakage of oil is, auxiliary oil circuit nozzle mount pad lining adopts method for welding to be fixed on mount pad, for ensureing the manufacturability of lining welding, a fabrication hole has been opened at nozzle mount pad place, hole, built with technique pin, adopts fusion welding method to be fixed on nozzle mount pad by technique pin.Due to lining soldered seam seepage in use procedure, cause fuel blow to enter lining and mount pad inner chamber, after crack fault appears in technique pin place weld seam, cause fuel oil to leak out from technique pin.

Adopt this technique pin-and-hole leakage of oil of conventional argon arc welding REPAIR WELDING before this, but can not effectively eliminate this fault always, cause maintenance part rejection rate high, maintenance cycle is long.

Summary of the invention

The object of this invention is to provide the restorative procedure of a kind of engine fuel pipe nozzle auxiliary oil circuit mount pad technique pin-and-hole leakage of oil, effectively to eliminate this fault.

The present invention is through dissecting the mount pad technique pin-and-hole of welding, find to be full of carbon distribution in mount pad technique pin-and-hole, during welding, carbon distribution heat can produce a large amount of gas and emerges from the leakage of pin-and-hole, make to add welding wire during welding very difficult, even there is larger leak, even if repeatedly fill silk, still there is a large amount of bubble in final repair welding welding line position, welding quality cannot ensure.This is the basic reason that conventional argon arc welding welding effectively can not eliminate this oil leakage fault.

According to this discovery, the present invention, through test of many times, finally determines the engine fuel pipe nozzle auxiliary oil circuit mount pad technique pin-and-hole leakage of oil restorative procedure comprised the following steps:

Carry out mark in leakage of oil place of engine fuel pipe nozzle auxiliary oil circuit mount pad technique pin-and-hole before step one, welding, then use air drill and grinder buffing, make face of weld occur metallic luster;

Step 2, with argon arc welding gun by seepage place heat fused, now not packed column GC, after gas is discharged completely from seepage place (time is greatly about 5 ~ 8 seconds) fast packed column GC weld;

Step 3, welding after stain check repair welding place, have not allowed crackle;

Step 4, leakage test, check repair welding place, do not allowed seepage.

The present invention adopts the method by meeting the packed column GC welding again after the eliminating of mount pad technique pin-and-hole leakage of thermogenetic gas, welding quality is guaranteed, solve the technical barrier effectively can not eliminating mount pad technique pin-and-hole oil leakage fault with conventional argon arc welding welding, reduce the scrappage of part, save maintenance cost, shorten maintenance cycle.

Accompanying drawing explanation

Fig. 1 is engine fuel pipe mount pad structural representation.

In figure: 1-working connection, 2-auxiliary oil circuit nozzle mount pad lining, 3-soldered seam, 4-technique pin, 5-technique pin weld seam (leakage), 6-auxiliary oil circuit.

Detailed description of the invention

Embodiment

The present embodiment carries out argon arc welding REPAIR WELDING for adopting the inventive method to the mount pad of engine fuel pipe shown in Fig. 1 intermediate fuel oil pipe nozzle auxiliary oil circuit mount pad technique pin-and-hole oil leakage fault.

As shown in Figure 1, the auxiliary oil circuit nozzle mount pad lining 2 be arranged on working connection 1 adopts soldering to be fixed on mount pad, for ensureing the manufacturability that this lining welds, the nozzle mount pad of auxiliary oil circuit 6 has been opened a fabrication hole, hole, built with technique pin 4, adopts fusion welding method to be fixed on nozzle mount pad by technique pin.Because the soldered seam 3 of lining in use procedure 2 has seepage, cause fuel blow to enter lining and mount pad inner chamber, when crack fault appears in technique pin place weld seam, fuel oil just leaks out from technique pin weld seam 5.

Adopt the inventive method to repair this leakage of oil place, first make marks at technique pin-and-hole leakage of oil place marking pen, with air drill and grinder buffing, make this place's face of weld occur metallic luster; Then with argon arc welding gun by seepage place heat fused, now not packed column GC, treat that gas is discharged (time is greatly about 5 ~ 8 seconds) completely from seepage place, quick packed column GC carries out argon arc welding welding; Through dyeing inspection repair welding place flawless after welding, leakage test ne-leakage.It is effectively, reliably that explanation the inventive method repairs the leakage of oil of aero-engine fuel pipe nozzle auxiliary oil circuit mount pad technique pin-and-hole.

Claims (1)

1. the restorative procedure of engine fuel pipe nozzle auxiliary oil circuit mount pad technique pin-and-hole leakage of oil, is characterized in that comprising the following steps:

Carry out mark in leakage of oil place of engine fuel pipe nozzle auxiliary oil circuit mount pad technique pin-and-hole before step one, welding, then use air drill and grinder buffing, make face of weld occur metallic luster;

Step 2, with argon arc welding gun by seepage place heat fused, now not packed column GC, after gas is discharged completely from seepage place, quick packed column GC welds;

Step 3, welding after stain check repair welding place, have not allowed crackle;

Step 4, leakage test, check repair welding place, do not allowed seepage.