CN103817414A - Tungsten electrode argon arc hot wire surfacing technique of main pump motor shaft and flywheel - Google Patents

Abstract

The invention relates to a tungsten electrode argon arc hot wire surfacing technique of a main pump motor shaft and a flywheel, and aims to establish a novel welding technique used for surfacing a critical component shaft of a main pump motor and a flywheel. A more advanced tungsten electrode argon arc hot wire surfacing technique is adopted to preheat a welding wire for welding before entering a weld pool, so that melting efficiency and welding speed are obviously increased, hoe wire welding has good stirring effect on the weld pool, the tungsten electrode argon arc hot wire surfacing technique is more suitable for welding thick nonferrous metals with large surface tension such as nickel base alloy, as compared with traditional argon arc welding, and high-efficient and high-quality nickel base build-up welds can be acquired. The tungsten electrode argon arc hot wire surfacing technique has high engineering application value and profound social significance.

Description

The tungsten argon arc hot wire welding bead-welding technology of main pump motor axle and flywheel

Technical field: the present invention relates to a kind of main pump motor axle and flywheel tungsten argon arc hot wire welding bead-welding technology.

Background technology: the integrality of main pump motor has important impact to the safe operation in a loop, its axis and flywheel technique for overlaying become main pump motor manufacture in link together with technical barrier.The welding method adopting is argon tungsten-arc welding, argon tungsten-arc welding is a kind of non-melt pole inert gas-shielded arc welding, utilize the argon gas formation protective layer that rifle mouth ejects that electric arc and air are isolated, prevent that airborne oxygen and nitrogen are to tungsten electrode, molten bath and heat affected area metal cause illeffects, thereby acquisition quality weld, be divided into cold silk and hot wire welding etc. according to wire feeding mode, the welding method of the former employing of built-up welding of axle and flywheel is the argon tungsten-arc welding of cold silk, although it is stable that the argon arc welding of cold silk has welding process, the advantages such as appearance of weld is attractive in appearance, but deposition efficiency is low, speed of welding is slow, because tungsten electrode is limited to the bearing capacity of electric current, cannot further improve wire feed rate and deposition efficiency by strengthening electric current, therefore the argon arc welding of cold silk is for built-up welding, welding efficiency is low, simultaneously because the less welding current of cold silk argon arc welding, cause molten bath cooling velocity too fast, during due to the nickel-bass alloy material of built-up welding, molten pool metal is large compared with thickness, tension force, it is slower that gas and impurity overflow, and then be easy to produce defect, welding quality is unstable, and repair rate is higher, causes the waste of resource and the raising of production cost.

Summary of the invention: the object of this invention is to provide the tungsten argon arc hot wire welding bead-welding technology of a kind of main pump motor axle and flywheel, improve the problems such as the deposition efficiency of former oil cooling silk argon arc-welding built-up welding is low, and welding quality is unstable.

Technical scheme of the present invention is: the tungsten argon arc hot wire welding bead-welding technology of a kind of main pump motor axle and flywheel, and (1) welding conditions:

Welding current 325～370A, weldingvoltage 11～15V, speed of welding 120～250mm/min, protection-gas welding 99.999%Ar, gas flow 18.8L/min, polarity: straight polarity direct current;

Exchange heater supply, welding wire electric current 50～60A, welding wire voltage 3～6V, welding wire protective gas 99.999%Ar, gas flow 4.7～7.1L/min, wire feed rate: 3～4m/min;

205 ℃ of minimum preheat temperatures, 255 ℃ of large interlayer temperatures, 704～746 ℃ of post weld heat treatment, are incubated 3 hours, welding position downhand welding;

(2) wlding:

Welding wire kind: SFA-5.14(nickel alloy filler wire) trade mark: ERNiCr-3(nichrome welding wire) specification: Φ 1.2mm;

(3) welding procedure:

A) built-up welding of axle, axle is pole pattern, the both sides of axle have two U-shaped grooves, adopt method built-up welding nichrome in U-shaped groove of tungsten argon arc hot wire welding, and axle is placed on turning rolls, utilize roller rotation, with the rolling of moving axis, realize automatic welding; Flywheel hub built-up welding, flywheel hub is disc, in two planes of disk, offers U-shaped annular groove, the method built-up welding nichrome in U-shaped groove that adopts tungsten argon arc hot wire welding, is placed on flywheel on positioner, utilizes the rotation of positioner, flywheel driven disc spins, realizes automatic welding;

B) first weld front preparation, surfacing part and near 100mm region are cleared up, reach after cleannes requirement, start preheating, 205 ℃ of preheating minimum temperature, adopt tungsten argon arc hot wire welding to start to carry out built-up welding after meeting the demands;

C) weld by above-mentioned welding conditions, when welding, welding gun does not swing, and utilizes turning rolls and positioner to rotarily drive workpiece and rotates, realize automatic welding, welding adopts monofilament, first utilizes resistance heat to carry out preheating to welding wire by heater supply, reaches after predetermined temperature, send into molten bath at electric arc rear, realize welding, workpiece rotates a circle, and is soldered after one weld seam, stop arc and adjust welding torch position, descending one weld seam welding;

D) welding sequence, welding bead starts to arrange from groove left side, and it is 1/3-1/2 weld width that per pass weld seam is pressed road amount;

E) after groove welding completely, carry out Non-Destructive Testing and heat treatment, complete this technique.

Under the condition that is 1.2mm at this technique gage of wire, the wire feed rate of cold silk argon tungsten-arc welding is generally 0.4-1m/min, the wire feed rate of hot wire argon tungsten-arc welding can reach 3-4m/min, more than the argon arc welding of the colder silk of deposition efficiency and speed of welding has improved twice, improve greatly production efficiency, and hot wire welding adopts the mode of wire feed after electric arc, there is to good stirring action in molten bath, simultaneously because welding wire is after preheating, can reduce the cooling velocity in molten bath, impurity and gas in molten bath are better overflowed, reduce the formation probability of defect, be more suitable for welding the thickness such as nickel-base alloy, the non-ferrous metal that surface tension is large, effectively guarantee product quality.New welding technique of the present invention is applied in many products, and face of weld moulding is good, and 100% by nondestructive flaw detection examination, has reached Expected Results.

Accompanying drawing explanation

Fig. 1 axle construction form schematic diagram

Fig. 2 built-up welding groove type schematic diagram

Fig. 3 uranium pile weldering assembling form schematic diagram.

Wherein: 1. 2. 3. 4. 5. portal frame of wire feeding disc of turning rolls of motor shaft of argon arc welding gun

Fig. 4 flywheel structure form schematic diagram.

Fig. 5 built-up welding groove type schematic diagram

Fig. 6 flywheel built-up welding assembling form schematic diagram

Wherein: 6. 7. 8. 9. manipulator of thrust disc wheel hub of argon arc welding gun of positioner

The specific embodiment

The tungsten argon arc hot wire welding bead-welding technology of main pump motor axle and flywheel, welding current 325～370A, weldingvoltage 11～15V, speed of welding 120～250mm/min, protection-gas welding 99.999%Ar, gas flow 18.8L/min, polarity: straight polarity direct current;

Exchange heater supply, welding wire electric current 50～60A, welding wire voltage 3～6V, welding wire protective gas 99.999%Ar, gas flow 4.7～7.1L/min, wire feed rate: 3～4m/min;

205 ℃ of minimum preheat temperatures, 255 ℃ of large interlayer temperatures, 704～746 ℃ of post weld heat treatment, are incubated 3 hours, welding position downhand welding;

(2) wlding:

Welding wire kind: SFA-5.14(nickel alloy filler wire) trade mark: ERNiCr-3(nichrome welding wire) specification: Φ 1.2mm;

(3) welding procedure:

A) built-up welding of axle, axle is pole pattern, the both sides of axle have two U-shaped grooves, as Fig. 1, the method built-up welding nichrome in U-shaped groove that adopts tungsten argon arc hot wire welding, as Fig. 2, is placed on axle on turning rolls, utilizes roller rotation, with the rolling of moving axis, realize automatic welding, as Fig. 3.

Flywheel hub built-up welding, flywheel hub is disc, in two planes of disk, offer U-shaped annular groove, as Fig. 4, adopt method built-up welding nichrome in U-shaped groove of tungsten argon arc hot wire welding, as Fig. 5, flywheel is placed on positioner, utilizes the rotation of positioner, flywheel driven disc spins, realize automatic welding, as Fig. 6.

B) first weld front preparation, surfacing part and near 100mm region are cleared up, reach after cleannes requirement, start preheating, 205 ℃ of preheating minimum temperature, adopt tungsten argon arc hot wire welding to start to carry out built-up welding after meeting the demands;

C) welding conditions: welding current 325～370A, weldingvoltage 11～15V, speed of welding 120～250mm/min, protection-gas welding 99.999%Ar, gas flow 18.8L/min, polarity: straight polarity direct current; Exchange heater supply, welding wire electric current 50～60A, welding wire voltage 3～6V, welding wire protective gas 99.999%Ar, gas flow 4.7～7.1L/min, wire feed rate: 3～4m/min; 205 ℃ of minimum preheat temperatures, 255 ℃ of large interlayer temperatures, 704～746 ℃ of post weld heat treatment, are incubated 3 hours, welding position downhand welding;

Weld by above-mentioned welding conditions, when welding, welding gun does not swing, utilizing turning rolls and positioner to rotarily drive workpiece rotates, realize automatic welding, welding adopts monofilament, first utilizes resistance heat to carry out preheating to welding wire by heater supply, reaches after predetermined temperature, send into molten bath at electric arc rear, realize welding.Workpiece rotates a circle, and is soldered after one weld seam, stops arc and adjusts welding torch position, is descending one weld seam welding;

D) welding sequence, welding bead starts to arrange from groove left side, and it is 1/3-1/2 weld width that per pass weld seam is pressed road amount, as Fig. 5

E) after groove welding completely, carry out Non-Destructive Testing and heat treatment, complete this technique.

Claims (1)

1. a tungsten argon arc hot wire welding bead-welding technology for main pump motor axle and flywheel, its spy is:

(1) welding conditions:

Welding current 325～370A, weldingvoltage 11～15V, speed of welding 120～250mm/min, protection-gas welding 99.999%Ar, gas flow 18.8L/min, polarity: straight polarity direct current;

Exchange heater supply, welding wire electric current 50～60A, welding wire voltage 3～6V, welding wire protective gas 99.999%Ar, gas flow 4.7～7.1L/min, wire feed rate: 3～4m/min;

205 ℃ of minimum preheat temperatures, 255 ℃ of large interlayer temperatures, 704～746 ℃ of post weld heat treatment, are incubated 3 hours, welding position downhand welding;

(2) wlding:

Welding wire kind: SFA-5.14(nickel alloy filler wire) trade mark: ERNiCr-3(nichrome welding wire) specification: Φ 1.2mm;

(3) welding procedure:

A) built-up welding of axle, axle is pole pattern, the both sides of axle have two U-shaped grooves, adopt method built-up welding nichrome in U-shaped groove of tungsten argon arc hot wire welding, and axle is placed on turning rolls, utilize roller rotation, with the rolling of moving axis, realize automatic welding; Flywheel hub built-up welding, flywheel hub is disc, in two planes of disk, offers U-shaped annular groove, the method built-up welding nichrome in U-shaped groove that adopts tungsten argon arc hot wire welding, is placed on flywheel on positioner, utilizes the rotation of positioner, flywheel driven disc spins, realizes automatic welding;

B) first weld front preparation, surfacing part and near 100mm region are cleared up, reach after cleannes requirement, start preheating, 205 ℃ of preheating minimum temperature, adopt tungsten argon arc hot wire welding to start to carry out built-up welding after meeting the demands;

C) weld by above-mentioned welding conditions, when welding, welding gun does not swing, and utilizes turning rolls and positioner to rotarily drive workpiece and rotates, realize automatic welding, welding adopts monofilament, first utilizes resistance heat to carry out preheating to welding wire by heater supply, reaches after predetermined temperature, send into molten bath at electric arc rear, realize welding, workpiece rotates a circle, and is soldered after one weld seam, stop arc and adjust welding torch position, descending one weld seam welding;

D) welding sequence, welding bead starts to arrange from groove left side, and it is 1/3-1/2 weld width that per pass weld seam is pressed road amount;

E) after groove welding completely, carry out Non-Destructive Testing and heat treatment, complete this technique.

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