CN102500856B - Vacuum brazing method for high-temperature alloy pipe parts - Google Patents

Abstract

The invention provides a vacuum brazing method for high-temperature alloy pipe parts. The method comprises the following steps: firstly coating nickel in the welding positions of pipe parts, secondly assembling high-temperature alloy pipe parts to be brazed in a way that the assembly gap is within the range of 0.03 mm to 0.08 mm, thirdly presetting an amorphous foil-like brazing alloy sheet with the thickness of 0.03 mm in the assembly gap of the high-temperature alloy pipe parts to be brazed, subsequently positioning the high-temperature alloy pipe parts by argon arc welding, and finally coating and injecting a solder paste made of powdery brazing alloy at the joint of the pipe parts and loading the high-temperature alloy pipe parts into a vacuum brazing furnace for vacuum brazing. The amorphous brazing alloy foil is preset in the assembly gap of the pipe parts to ensure welding and assembly gap. The amorphous brazing alloy foil and the powdery brazing alloy interact during the welding process, so as to facilitate spread and moistening of the brazing alloy and also reduce the flow distance of the powdery brazing alloy, thus obtaining a great improvement of welding quality.

Description

A kind of vacuum brazing method for high-temperature alloy pipe parts

Technical field

The present invention relates to the part manufacture field, be specially a kind of vacuum brazing method for high-temperature alloy pipe parts.

Background technology

China often adopts vacuum brazing technique in the high temperature alloy pipes subclass part manufacturing assembling of aero-engine.Because the fit clearance of vacuum brazing technique Welded Joints is strict, and pipe class part is difficult to guarantee whole circle joint clearance of brazing uniformity in assembling process, the x-ray examination method that the welding quality of postwelding brazed seam inside adopts, there is fuzzy " black line " problem on exograph, is difficult to the welding quality of part is provided accurate judgement.For a long time, the quality of vacuum brazing problem of high temperature alloy pipes subclass part is restricting the normal payment of engine always.

Summary of the invention

The technical problem that solves

The problem that exists for solving prior art, the present invention proposes a kind of vacuum brazing method for high-temperature alloy pipe parts, to improve a solder yield of part.

Technical scheme

Technical scheme of the present invention is:

Described a kind of vacuum brazing method for high-temperature alloy pipe parts is characterized in that: adopt following steps:

Step 1: in the welding position nickel plating of high temperature alloy pipes subclass part to be brazed;

Step 2: adopt the apolegamy processing technology, high temperature alloy pipes subclass part to be brazed is assembled, the fit-up gap is in 0.03mm～0.08mm scope;

Step 3: presetting thickness in the fit-up gap of high temperature alloy pipes subclass part to be brazed is 0.03mm amorphous brazing foil sheet, then high temperature alloy pipes subclass part is carried out argon arc welding and locates;

Step 4: the high temperature alloy pipes subclass part joint after processing through step 3 is coated with the solder paste of annotating by the powdered filler metal modulation, then high temperature alloy pipes subclass part is sent into vacuum brazing furnace and carries out vacuum brazing.

Beneficial effect

Test shows, the welding position carried out nickel plating technology process, and the performance of Welded Joints does not produce any adverse effect, but to the raising successful of vacuum brazing qualification rate.Can guarantee the assemble welding gap and preset the amorphous filler metal paillon foil in the fit-up gap of high temperature alloy pipes subclass part joint, amorphous filler metal paillon foil and powdered filler metal interact in welding process, the spreading wetting that is conducive to solder, reduced simultaneously the mobile distance of powdered filler metal, welding quality is greatly improved, and this method is simple to operate, be fit to the production of part in enormous quantities, this method of subsequent production proof employing can be with stable the guaranteeing more than 95% of the solder yield of high temperature alloy pipes subclass part.

The specific embodiment

Below in conjunction with specific embodiment, the present invention is described.

Embodiment:

Step 1: in the welding position nickel plating of high temperature alloy pipes subclass part to be brazed.

Because the emery wheel cutting is adopted in the blanking of high temperature alloy tube members, can cause the shallow epoxy of tube surface welding position, this is to affect the principal element that solder is sprawled, and is also the main cause that affects the weld parts qualification rate.Because pipe cutting does not also have not only economy but also is suitable for the baiting method of mass, we adopt the many kinds of measures such as pickling, emery cloth polishes, vacuum purification to compare test, the part qualification rate does not obviously improve, the final method of nickel plating of selecting is tested, soldering is overlapped the zone weld front nickel plating, and the test plate (panel) after welding is carried out performance test, result of the test sees the following form:

As seen, nickel plating sample shear shearing stress data are steady, and mean value has no obvious reduction with nickel plating test plate (panel) data are unsuitable, and the performance of visible nickel plating technology Welded Joints is not impact almost.

On the basis of above-mentioned test plate (panel) nickel plating test, carried out the soldering test of simulating piece.In order to verify the human factor impact, adopt two groups of personnel's contrast tests simultaneously, result of the test sees the following form:

The operator	Input quantity	Qualified quantity	Qualification rate
				A	5	4	80％
B	5	4	80％

As seen, the nickel plating effect is remarkable, and operating personnel are on not obviously impact of qualification rate.On this basis, we again alignment type spare carried out examination processing, the results are shown in following table:

Batch number	Number feeds intake	Passing number	Qualification rate
				0601	10	9	90％
0615	105	100	95％
				0616	120	109	91％
0617	258	241	93.8％

As seen, after nickel plating, the vacuum brazing qualification rate is improved successful, can satisfy the need of production of mass.

Step 2: adopt the apolegamy processing technology, high temperature alloy pipes subclass part to be brazed is assembled, the fit-up gap is in 0.03mm～0.08mm scope.Here be mainly by controlling the endoporus dimensional tolerance of high temperature alloy pipe joint, and coordinate apolegamy technique, the fit clearance of the external diameter of the internal orifice dimension of pipe joint and tube members is controlled in 0.06mm～0.16mm scope.

Step 3: presetting thickness in the fit-up gap of high temperature alloy pipes subclass part to be brazed is 0.03mm amorphous brazing foil sheet, then high temperature alloy pipes subclass part is carried out argon arc welding and locates.

This step is orientation assemble technique.Amorphous alloy is the new material with specific physical mechanical performance and chemical property, and why the amorphous alloy product has high-performance, is because the tissue of this alloy is in rapid solidification (cooling velocity 10 ⁴℃/S～10 ⁶℃/particular tissues that S) forms in process.The amorphous alloy cored solder be can practical application Novel welding material.The amorphous alloy scolder is different with the lotion scolder from powder, alloying component metering accurately, narrow, the chemical composition uniformity of fusion temperature scope and microstructure uniformity is high, diffusion activity and attachment activity is high, easily flow to the gap, brazing area is without microscopic segregation and micropipe, thereby the welding point that obtains has high strength and high corrosion resistance.Preset the amorphous filler metal paillon foil in the gap of joint for pipe, offset the tightening force of argon arc solder joint when argon arc welding is located, the joint clearance of brazing also can guarantee the technological requirement of 0.03-0.08mm behind the location.

Step 4: the high temperature alloy pipes subclass part joint after processing through step 3 is coated with the solder paste of annotating by the powdered filler metal modulation, then high temperature alloy pipes subclass part is sent into vacuum brazing furnace and carries out vacuum brazing.

Enter the stokehold in vacuum brazing and be coated with the solder paste of annotating by the powdered filler metal modulation in the joint again, powdered filler metal is mainly used in the welding of part here.This two states solder of amorphous filler metal paillon foil and powdered filler metal interacts in welding process, more is conducive to the spreading wetting of solder, has reduced simultaneously the mobile distance of powdered filler metal, and welding quality is greatly improved.

In addition, for specific part material and cored solder, also should be optimized welding condition.

For the solution strengthening high temperature alloy, must just can obtain good high-temperature behavior, so brazing temperature can not be too high, otherwise will cause the mother metal grain growth with its alloying element and the abundant solid solution of compound thereof in matrix, reduce the mother metal performance.In the present embodiment, the material of pipe part is GH625, therefore select the GH625 alloy as subjects.The soldering of this part is advanced heat and is counted and may reach under limiting case 6 times, provides foundation for optimizing the welding condition position, and we have carried out following test:

A. multiple welding is on mother metal grain size impact test

Experimental condition: 1045 ± 5 ℃ of brazing temperatures are incubated 15-20 minute.Test data sees the following form:

Numbering	Welding times	The inner tube grain size number	The outer tube grain size number
				3-1～5#	3	5～6 grades	5～6 grades
4-1～5#	4	5～6 grades	5～6 grades
				5-1～2#	5	5～6 grades	5～6 grades
6-1～3#	6	5～6 grades	5 grades
				6-4～5#	6	5～6 grades	5～6 grades

B. the continuous high temperature weld heating is on mother metal grain size impact test

Experimental condition: 1050 ± 10 ℃ of brazing temperatures.Test data sees the following form:

Numbering	Temperature retention time	Grain size number	Brazing temperature	Be equivalent to the soldering number of times
					1#	3 hours	5～6 grades	1050±10℃	9 times
2#	4 hours	5～6 grades	1050±10℃	12 times
					3#	Do not advance stove	8 grades	Do not advance stove	0 time

GH625 alloy material standard (Q/5B 4097-95) requires the tubing mean grain size should reach 5 grades or thinner, allows indivedual 3 grades of grain sizes to exist.From upper table as seen, the GH625 mother metal repeatedly advances the slice postwelding through 1045 ℃～1050 ℃ ± 10 ℃ insulations 30 minutes or longer time high temperature, and grain size has necessarily grows up, but still meets the Q/5B4097-95 standard-required.

According to above test, determine that welding condition is as follows: 1045 ± 5 ℃, insulation 10～20min.

Claims (1)

1. vacuum brazing method for high-temperature alloy pipe parts is characterized in that: adopt following steps:

Step 1: in the welding position nickel plating of high temperature alloy pipes subclass part to be brazed;

Step 2: adopt the apolegamy processing technology, high temperature alloy pipes subclass part to be brazed is assembled, the fit-up gap is in 0.03mm～0.08mm scope;

Step 3: presetting thickness in the fit-up gap of high temperature alloy pipes subclass part to be brazed is 0.03mm amorphous brazing foil sheet, then high temperature alloy pipes subclass part is carried out argon arc welding and locates;

Step 4: the high temperature alloy pipes subclass part joint after processing through step 3 is coated with the solder paste of annotating by the powdered filler metal modulation, then high temperature alloy pipes subclass part is sent into vacuum brazing furnace and carries out vacuum brazing.