CN102146551B - Method for copious cooling reinforcement processing of MB5 magnesium alloy argon arc welding joint - Google Patents

Method for copious cooling reinforcement processing of MB5 magnesium alloy argon arc welding joint Download PDF

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Publication number
CN102146551B
CN102146551B CN201110057835A CN201110057835A CN102146551B CN 102146551 B CN102146551 B CN 102146551B CN 201110057835 A CN201110057835 A CN 201110057835A CN 201110057835 A CN201110057835 A CN 201110057835A CN 102146551 B CN102146551 B CN 102146551B
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China
Prior art keywords
magnesium alloy
argon arc
welding joint
arc welding
temperature
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CN201110057835A
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Chinese (zh)
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CN102146551A (en
Inventor
吴志生
赵菲
刘翠荣
曾亮
靳鹏飞
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太原科技大学
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Publication of CN102146551A publication Critical patent/CN102146551A/en
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Abstract

The invention relates to a method for copious cooling reinforcement processing of an MB5 magnesium alloy argon arc welding joint, belonging to the technical field of copious cooling reinforcement processing of a metal piece. The method comprises the following operation steps: (1) quenching the MB5 magnesium alloy welding joint obtained by argon arc welding; (2) putting the quenched MB5 magnesium alloy welding joint in a copious cooling processing device controlled by a control system; (3) reducing the temperature of the copious cooling processing device to minus 170 DEG C to minus 190 DEG C from room temperature at the cooling speed of 6 DEG C-8 DEG C/min; (4) insulating for 4 hours-6 hours; and (5) cutting off a supply power, closing a cold source, and opening the device so as to obtain the welding piece at room temperature in the air. The method has the advantages that (1) the hardness and strength of the welding joint are improved, and grain size can also be fined; and (2) operation is simple, cost is low, toxicity and pollution do not occur.

Description

Method to MB5 magnesiumalloy argon arc welding joint deep cooling intensified process

Technical field:

The invention belongs to metalwork deep cooling intensified process technical field, be specifically related to a kind of method MB5 magnesiumalloy argon arc welding joint deep cooling intensified process.

Background technology:

Magnesium is one of the abundantest light metal element of reserves on the earth; Magnesiumalloy is a kind ofly can satisfy various industry requirements, light material that development prospect is considerable; Compare with other materials such as steel with aluminium, have that density is little, specific tenacity is high, specific rigidity is high, damping and amortization, machinability, thermal conductivity are good; The electromagnetic shielding ability is strong; Processing welding and damping capacity is good and advantages such as dimensional stabilizing, cheap, recyclable utilization is described as " 21 century green engineering material ", has broad application prospects in fields such as machinofacture, automobile making, aerospace, navigation, electronics, military affairs, communication, opticinstrument and computingmachines.In above-mentioned every profession and trade is used, usually can run into and to weld the magnesiumalloy component; Because the fusing point of magnesiumalloy is low, heat conduction is fast, needs high-power during welding heating; The heat affected zone is overheated easily; The heat that absorbs makes the heat affected zone that grain growth take place, thus cause the heat affected zone organize crystal grain thick, cause the magnesium alloy weld joint mechanical properties decrease.Mg content is very high in the MB5 magnesium alloy plate, and the boiling point of magnesium is lower, and magnesium at high temperature is easy to evaporation, oxidation and nitrogenize, and the oxide compound of formation and nitride are very crisp, thereby makes the mechanical properties decrease of joint.Thereby influenced request for utilization.In order to address the above problem, the welding joint enhancement method of prior art employing at present has three kinds: 1. postweld heat treatment.Promptly the workpiece after the welding is heat-treated; This method can make the joint mechanical property necessarily recovered, and its intensity generally can improve 3%~5%, but decrease ductility 25%~35%; Often only be applicable to small-sized weldment; Postwelding also deforms easily, and heat-treating simultaneously needs the labor energy, also can cause certain pollution to environment; 2. local reinforcement method.Promptly thicken the size of welding joint, supporting capacity is improved.This method has increased the consumption of the material and the energy, has increased the weight of workpiece, also can produce unrelieved stress in the joint, causes to come off, and is insecure, often only is used for large-scale component; 3. with the weldering rolled-on method.Be meant that in welding process butt welded seam and nearly seam district implement to roll.This method need increase rolling device and labor capacity, has increased cost, and only is applicable to automatic welding.In a word, above-mentioned three kinds of prior aries all exist some shortcomings and application limit.

Summary of the invention:

The purpose of this invention is to provide and a kind of the MB5 magnesium alloy weld joint is carried out the method for deep cooling intensified process, can overcome the shortcoming that prior art exists effectively.

The present invention is achieved in that and it is characterized in that a kind of employing carries out the method for deep cooling intensified process to metalwork that operation steps is: the MB5 magnesium alloy weld joint that 1. will pass through the argon arc welding quenches; 2. the MB5 magnesium alloy weld joint after will quenching is put into by in the cryogenic treatment apparatus under the deep cooling processing system control; 3. the rate of temperature fall with 6 ℃~8 ℃/min drops to-170 ℃~-190 ℃ with the temperature in the cryogenic treatment apparatus from room temperature; 4. be incubated 4~6 hours; 5. cut off the electricity supply, close low-temperature receiver, opening unit lets weldment in air, reach room temperature;

Advantage of the present invention and positively effect have: 1. to after the MB5 magnesium alloy weld joint process deep cooling intensified process, hardness can improve 8%~12%, and intensity can improve 10%~14%, and the interior tissue grain fineness number has obtained refinement and homogenizing; 2. the low-temperature receiver that adopts is a liquid nitrogen.Liquid nitrogen is the sub product of system oxygen industry, and the source is wide, transports easily and stores, and stable chemical performance, nontoxic, pollution-free is not corroded workpiece, and cheap, not only cost is low, and helps environmental protection; 3. simple to operate.

Embodiment:

1. be example with the MB5 magnesium alloy workpiece that connects through argonaut welding, operation steps is following:

1. will pass through the MB5 magnesium alloy weld joint that argonaut welding takes over adopts Forced water cooling to quench;

2. it is low-temperature receiver and by in the computer-controlled DWS-2188 deep cooling strengthening and processing device that the MB5 magnesium alloy weld joint after will quenching is put into the liquid nitrogen;

3. the rate of temperature fall with 7 ℃/min drops to-175 ℃ with the temperature in the cryogenic treatment apparatus from room temperature;

4.-175 ℃ of insulations 6 hours;

5. cut off the electricity supply, close liquid nitrogen, opening unit lets welding joint in air, reach room temperature.

MB5 magnesium alloy weld joint after the above-mentioned steps sub-zero treatment improves 11% and 14% respectively before hardness and the strength ratio sub-zero treatment.

2. be example with the MB5 magnesiumalloy welding work pieces that connects through manual argon arc welding, operation steps is following:

1. will pass through the MB5 magnesium alloy weld joint that argonaut welding takes over adopts Forced water cooling to quench;

2. it is low-temperature receiver and by in the computer-controlled DWS-2188 deep cooling strengthening and processing device that the MB5 magnesium alloy weld joint after will quenching is put into the liquid nitrogen;

3. the rate of temperature fall with 7 ℃/min drops to-190 ℃ with the temperature in the cryogenic treatment apparatus from room temperature;

4.-190 ℃ of insulations 5.5 hours;

5. cut off the electricity supply, close liquid nitrogen, opening unit lets weldment in air, reach room temperature.

MB5 magnesium alloy weld joint after the above-mentioned steps sub-zero treatment improves 12% and 13% respectively before hardness and the strength ratio sub-zero treatment.

Claims (1)

1. method to MB5 magnesiumalloy argon arc welding joint deep cooling intensified process is characterized in that operation steps is: the MB5 magnesium alloy weld joint that 1. will pass through the argon arc welding quenches; 2. the MB5 magnesium alloy weld joint after will quenching is put in the cryogenic treatment apparatus by system control; 3. the rate of temperature fall with 6 ℃~8 ℃/min drops to-170 ℃~-190 ℃ with the temperature in the cryogenic treatment apparatus from room temperature; 4. be incubated 4~6 hours; 5. cut off the electricity supply, close low-temperature receiver, opening unit lets weldment in air, reach room temperature.
CN201110057835A 2011-03-08 2011-03-08 Method for copious cooling reinforcement processing of MB5 magnesium alloy argon arc welding joint CN102146551B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201110057835A CN102146551B (en) 2011-03-08 2011-03-08 Method for copious cooling reinforcement processing of MB5 magnesium alloy argon arc welding joint

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201110057835A CN102146551B (en) 2011-03-08 2011-03-08 Method for copious cooling reinforcement processing of MB5 magnesium alloy argon arc welding joint

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CN102146551B true CN102146551B (en) 2012-10-24

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5865913A (en) * 1995-06-19 1999-02-02 300 Below, Inc. Deep cryogenic tempering process based on flashing liquid nitrogen through a dispersal system
CN101463454A (en) * 2009-01-16 2009-06-24 中南大学 Method for preparing bulk nano/superfine crystal grain magnesium alloy by twinning deformation

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5865913A (en) * 1995-06-19 1999-02-02 300 Below, Inc. Deep cryogenic tempering process based on flashing liquid nitrogen through a dispersal system
CN101463454A (en) * 2009-01-16 2009-06-24 中南大学 Method for preparing bulk nano/superfine crystal grain magnesium alloy by twinning deformation

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
陈鼎 等.深冷处理对铸态ZK60镁合金显微组织和力学性能的影响.《机械工程材料》.2011,第35卷(第2期),第16-19页. *
陈鼎 等.镁合金深冷处理研究.《湖南大学学报(自然科学版)》.2008,第35卷(第1期),第62-65页. *

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