CN1990151A - Titanium alloy vacuum hollow cathode pinhole type penetrating electric arc welding method - Google Patents
Titanium alloy vacuum hollow cathode pinhole type penetrating electric arc welding method Download PDFInfo
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- CN1990151A CN1990151A CN 200510135348 CN200510135348A CN1990151A CN 1990151 A CN1990151 A CN 1990151A CN 200510135348 CN200510135348 CN 200510135348 CN 200510135348 A CN200510135348 A CN 200510135348A CN 1990151 A CN1990151 A CN 1990151A
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Abstract
A titanium alloy vacuum hollow cathode hole penetrating arc welding method is achieved under certain equipment conditions and welding parameters. Namely the centre of welding molten pool always has a penetrated hole during the process of titanium alloy welding, the electric arc penetrates whole welding plate, and the electric arc can be saw from back, the current flow is reduced when recall the electric arc, the hole closes gradually and disappears last. The welding method in the invention can enhance the welding quality of titanium alloy container products greatly, the art allowance of welding is bigger, it is easier to ensuring the consistency of products when batch production, it fills the gaps in relevant fields at home and abroad.
Description
Technical field
The invention belongs to welding field, especially a kind of arc-welding method that is used for titanium alloy.
Background technology
Titanium alloy container class product generally adopts electron beam or argon-are welding technology to weld production.
Because electron beam belongs to the high energy beam welding, the back of weld existence was splashed " fifth wheel " when its heat production mechanism had determined the titanium alloy welding, on the container inner wall surface, was difficult to cleaning.Processes such as Welder author takes that electron beam defocuses are made great efforts to reduce and are splashed, because the generation of splashing is the problem on the electron beam welding heat production mechanism, so, though can improve, but still be difficult to thorough elimination.
And adopt argon tungsten-arc welding welding titanium alloy container class product, and then because titanium alloy fusing point height, good fluidity, reason such as thermal conductivity factor is little is easy to produce " burning " defective, so must adopt the short arc welding, the welding operation difficulty is bigger.And the protection requirement is very high during owing to the titanium alloy welding, and the nearly seam district metal that is in high temperature oxidation very easily takes place, inhales hydrogen and suction nitrogen, and the overheated grain growth that makes in heat affected area, thereby causes joint mechanical property to descend.
The hollow cathode welding mechanism is: adopt a sleeve cathode welding gun, under vacuum condition, feed a small amount of argon gas as ionization medium.After effect that the electronics of overflowing from negative electrode is subjected to space electric field is accelerated gradually, bump with the atom of gas, these gas atoms are excited and ionization.The new positive particle that produces is bombarding cathode again, and so reciprocal causation promotes mutually, and the cathode surface temperature is risen, thereby can launch the thermoelectron of high current density, the self-maintained discharge of pilot arc.Thereby form the required electric arc of welding, the fusing workpiece is realized connecting.
The former Soviet Union starts from 1969 to the hollow cathode Research on Welding Technology, and initial research work is carried out by welding teaching and research room of Bao Man engineering college.The seventies later stage has been carried out hollow cathode arc flash-over characteristic, welding conditions and technological comprehensive research.The eighties initial stage applies in the former Soviet Union, and alternative electron beam welding is used for the welding production of titanium alloy container class product.After this, improve hollow cathode rifle structure, the research work that improves aspects such as hollow cathode life-span and arc discharge mechanism is still underway.But the welding procedure that the former Soviet Union is studied is conventional penetration type technology, and promptly the weld seam broad approaches argon-arc welding seam and is shaped, and welding technology margin is less.Still there is not titanium alloy hollow cathode penetrating arc welding technique both at home and abroad.
Summary of the invention
For fear of above-mentioned deficiency; the object of the present invention is to provide a kind of titanium alloy vacuum hollow cathode pinhole type penetrating electric arc welding method; not only improve the welding point comprehensive mechanical property; improve welding technology margin; and can satisfy the needs that titanium alloy container class product welding engineering is used; realize one side welding with back formation, the spatter that causes when avoiding the electron beam welding titanium alloy " fifth wheel " problem, the overheated and difficult protection problem in heat affected area in the time of argon arc welding can being avoided again.
The used welding gun of the present invention is the tubulose spill diaphragm negative electrode welding gun (patent No.: ZL98249088.7) with the Miller source of welding current, under vacuum condition, feed a small amount of gas as ionization medium.After effect that the electronics of overflowing from negative electrode is subjected to space electric field is accelerated gradually, bump with the atom of gas, these gas atoms are excited and ionization.The new positive particle that produces is bombarding cathode again, and so reciprocal causation promotes mutually, and the cathode surface temperature is risen, thereby can launch the thermoelectron of high current density, the self-maintained discharge of pilot arc.Thereby form the required electric arc of welding, the fusing workpiece is realized connecting.
When welding parameter met certain condition, in the titanium alloy welding process, there was a penetrating type aperture all the time in welding pool central authorities, electric arc runs through whole welding thickness of slab, the visible arc column in the back side, when receiving arc in welding process decay current, aperture is closed gradually, last complete obiteration.
The condition that realizes titanium alloy hollow cathode pinhole type penetrating electric arc welding method necessity is as follows:
(1) set up the welding booth of vacuum environment, room pressure is less than 5 * 10
-2Pa;
(2) feed (5～50) ml/min gas in the sleeve cathode of welding gun;
(3) adopt one group of DC pulse welding condition of mating, background current and peak point current ratio are 0.5～0.8, and peak point current shared time (dutycycle) in a pulse period is 10%～50%; Pulse frequency is 1～10Hz.
Owing to adopted technique scheme, the present invention to have following advantage and effect:
1, the weld seam that forms of the present invention narrower (be equivalent to penetration technology 60%), the heat affected area also reduces.It is close that weld width and electron beam defocus welding (for reducing spatter) weld width.Appearance of weld is the back of weld uniformity especially, and welding technology margin is bigger, promptly works as welding current and fluctuates within the specific limits, and appearance of weld still can be stablized, uniformity.
2, adopt method of the present invention, can improve the welding quality of titanium alloy container class product greatly, because welding technology margin is bigger, for example when welding current fluctuates appearance of weld still can stablize, uniformity, the welding operation difficulty is reduced greatly, guarantee the uniformity of product quality when being convenient to produce in batches.
The specific embodiment
Hollow cathode pinhole type penetrating electric arc welding method need could be set up under certain welding parameter condition.
When titanium alloy thickness is 4.5mm, when welding current was 220A, background current and peak point current ratio were 0.7, and peak point current shared time (dutycycle) in a pulse period is 50%; When pulse frequency is 4Hz, can realize stable hollow cathode pinhole type penetrating arc welding.
When welding current is 250A, background current and peak point current ratio are 0.55, and peak point current shared time (dutycycle) in a pulse period is 50%; When pulse frequency is 4Hz, can realize stable hollow cathode pinhole type penetrating arc welding.
When welding current is 280A, background current and peak point current ratio are 0.55, and peak point current shared time (dutycycle) in a pulse period is 40%; When pulse frequency is 4Hz, can realize stable hollow cathode pinhole type penetrating arc welding.
When welding current less than 220A or greater than 280A, because of the sweating heat input quantity is not enough or excessive, be difficult to realize stable hollow cathode pinhole type penetrating arc welding.
Claims (4)
1, a kind of titanium alloy vacuum hollow cathode pinhole type penetrating electric arc welding method, it is characterized in that: under vacuum condition, feed a small amount of gas as ionization medium, when welding parameter meets certain condition, in the titanium alloy welding process, there is a penetrating type aperture all the time in welding pool central authorities, electric arc runs through whole welding thickness of slab, the visible arc column in the back side, when receiving arc in welding process decay current, aperture is closed gradually, last complete obiteration.
2, titanium alloy vacuum hollow cathode pinhole type penetrating electric arc welding method according to claim 1 is characterized in that: set up the welding booth of vacuum environment, room pressure is less than 5 * 10
-2Pa.
3, titanium alloy vacuum hollow cathode pinhole type penetrating electric arc welding method according to claim 1 is characterized in that: feed (5～50) ml/min gas in the sleeve cathode of welding gun.
4, titanium alloy vacuum hollow cathode pinhole type penetrating electric arc welding method according to claim 1, it is characterized in that: background current and peak point current ratio are 0.5～0.8, and peak point current shared time (dutycycle) in a pulse period is 10%～50%; Pulse frequency is 1～10Hz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510135348 CN1990151A (en) | 2005-12-30 | 2005-12-30 | Titanium alloy vacuum hollow cathode pinhole type penetrating electric arc welding method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510135348 CN1990151A (en) | 2005-12-30 | 2005-12-30 | Titanium alloy vacuum hollow cathode pinhole type penetrating electric arc welding method |
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| CN1990151A true CN1990151A (en) | 2007-07-04 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104227191A (en) * | 2014-09-10 | 2014-12-24 | 北京工业大学 | Low-back-pressure penetration electric arc welding device and method |
| CN104298817A (en) * | 2014-09-26 | 2015-01-21 | 中国船舶重工集团公司第七二五研究所 | Double-ellipse exponential decay body heat source model for simulating high-energy beam welding |
| CN105397245A (en) * | 2015-12-01 | 2016-03-16 | 黑龙江工程学院 | Active hollow-cathode vacuum electric arc welding device and method |
-
2005
- 2005-12-30 CN CN 200510135348 patent/CN1990151A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104227191A (en) * | 2014-09-10 | 2014-12-24 | 北京工业大学 | Low-back-pressure penetration electric arc welding device and method |
| CN104227191B (en) * | 2014-09-10 | 2016-04-20 | 北京工业大学 | A kind of low back pressure penetrating arc welder and method |
| CN104298817A (en) * | 2014-09-26 | 2015-01-21 | 中国船舶重工集团公司第七二五研究所 | Double-ellipse exponential decay body heat source model for simulating high-energy beam welding |
| CN104298817B (en) * | 2014-09-26 | 2018-03-23 | 中国船舶重工集团公司第七二五研究所 | A kind of bielliptic(al) exponential damping body heat source model for being used to simulate high energy beam welding |
| CN105397245A (en) * | 2015-12-01 | 2016-03-16 | 黑龙江工程学院 | Active hollow-cathode vacuum electric arc welding device and method |
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Open date: 20070704 |