Nickel-based brazing filler metal for oil cooler quickly brazed in low vacuum condition

A nickel-based brazing filler metal and oil cooler technology, applied in welding/cutting media/materials, welding media, welding equipment, etc., can solve the problem of increased use and maintenance costs of vacuum furnaces, extremely high vacuum requirements, and pollution of furnace atmosphere, etc. problems, to achieve the effect of increasing the wetting and spreading performance, meeting the strength requirements, and solving the problem of blackening

Inactive Publication Date: 2018-07-06
ZHEJIANG ASIA GENERAL SOLDERING & BRAZING MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the current welding process is not changed, but the traditional copper solder is directly switched to nickel-based solder, the problem is that the nickel-based solder will be oxidized, resulting in blackening of the surface
If all the low vacuum is transformed into a high vacuum, the cost will increase more, and the high vacuum brazing furnace has extremely high requirements on the vacuum degree. If it is used for a long time, the volatile matter in the brazing material will form oily residue on the furnace wall. Contaminate the atmosphere of the furnace, resulting in a substantial increase in the later use and maintenance costs of the vacuum furnace

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: This embodiment specifies the structure and brazing requirements of the oil cooler, as follows:

[0018] The oil cooler in this embodiment is a stainless steel oil cooler, which is a kind of plate-fin heat exchanger, and is more compact in structure, and its cold and hot passages are arranged at intervals. The hot channel is connected with a heat medium, that is, the high-temperature engine oil from the oil pump, and the cold channel is connected with a cooling medium, that is, a cooling liquid, a mixed solution of 50% ethylene glycol and 50% water. The structural composition of the oil cooler includes a bottom mounting plate, a core body and a top plate. An oil inlet, an oil outlet, a coolant inlet and a coolant outlet are arranged on the bottom mounting plate. The oil inlet, the oil outlet and the hot channel together form the oil circuit, and the coolant inlet, the coolant outlet and the cold channel together form the water channel. The core is the co...

Embodiment 2

[0021] Embodiment 2: the present embodiment has mainly specified the composition, preparation steps and applicable equipment of the nickel-based brazing filler metal of oil cooler fast brazing under low vacuum conditions, as follows:

[0022] The chemical composition and weight percentage of nickel-based solder are: Cr: 28.0-30.0%, P: 5.0-7.0%, Si: 3.5-4.5%, Mn: 0.3-0.5%, Ti: 0.1-0.2%, Fe: 2.0~5.0%, sum of impurity elements S, O, N:

[0023] 0~0.2%, C: 0~0.2%, the balance is Ni;

[0024] The preparation steps of nickel-based solder include:

[0025] Step 1: choose the nickel powder, chromium powder, phosphorus powder, silicon powder, titanium powder, manganese powder, ferrochromium powder that the particle size is all greater than 99.0% (mass fraction), particle size, according to the chemical composition of nickel-based solder and its % by weight configuration raw material;

[0026] Step 2: Put the raw materials into the vacuum induction furnace to heat and melt, and contr...

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PUM

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Abstract

The invention relates to a nickel-based brazing filler metal for an oil cooler quickly brazed in a low vacuum condition. The nickel-based brazing filler metal comprises the following chemical components in percentage by weight: 28.0-30.0% of Cr, 5.0-7.0% of P, 3.5-4.5% of Si, 0.3-0.5% of Mn, 0.1-0.2% of Ti, 2.0-5.0% of Fe, 0-0.2% of sum of impurity elements S, O and N, 0-0.2% of C and the balanceof Ni. By adding ferrochromium powder, resistance to oxidation of an alloy in the low vacuum condition can be improved, so that a blackening problem is solved; by adding titanium and manganese, traceoxygen can be removed in the low vacuum condition, so that the wetting spreadability property of the brazing filler metal on stainless steel is improved. The novel nickel-based paste brazing filler metal has a relatively good flowing property, is moderate in cost, meets the demand on strength, and has good corrosion resistance.

Description

technical field [0001] The invention relates to the field of welding, in particular to a nickel-based brazing filler metal for rapid brazing of an oil cooler under low vacuum conditions. Background technique [0002] With the continuous upgrading of emission regulations, the requirements of the engine are also constantly increasing. The oil temperature of the engine lubrication system is getting higher and higher, even as high as 150°C, and the role of the oil cooler is increasing. At present, most stainless steel oil cooler products are welded with pure copper solder. During use, it is found that high-temperature engine oil continuously scours the copper in the channel of the oil cooler to cause copper corrosion. affect its performance. [0003] At present, domestic and international customers such as Sinotruk, Xichai, Cummins, Caterpillar, and Perkins have clearly put forward the demand for low-copper stainless steel oil coolers. The common welding method for oil cooler...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30
CPCB23K35/304
Inventor 张玉金霞陆青松韩琦张立超齐云飞
Owner ZHEJIANG ASIA GENERAL SOLDERING & BRAZING MATERIAL
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