CN1073904C - Method for explosive connection welding rotary thin-wall shells - Google Patents
Method for explosive connection welding rotary thin-wall shells Download PDFInfo
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- CN1073904C CN1073904C CN 98107285 CN98107285A CN1073904C CN 1073904 C CN1073904 C CN 1073904C CN 98107285 CN98107285 CN 98107285 CN 98107285 A CN98107285 A CN 98107285A CN 1073904 C CN1073904 C CN 1073904C
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- 238000003466 welding Methods 0.000 title claims abstract description 96
- 239000002360 explosive Substances 0.000 title claims abstract description 83
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000005474 detonation Methods 0.000 claims abstract description 36
- 238000004880 explosion Methods 0.000 claims description 32
- 230000004323 axial length Effects 0.000 claims description 2
- 230000006378 damage Effects 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
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- 230000000977 initiatory effect Effects 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 150000007514 bases Chemical class 0.000 description 4
- 238000005452 bending Methods 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 238000005422 blasting Methods 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012946 outsourcing Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000005493 welding type Methods 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000002775 capsule Substances 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Abstract
The present invention relates to a technique for connecting a thin-walled rotating shell by explosive welding. The present invention is characterized in that a high explosive strips and rings are arranged on a detonating end surface on which main charge packages are welded; detonation velocity differences are utilized to adjust detonation waveforms and explosive welding parameters; the complete cycle welding of the rotating shell is achieved by means of single-point detonation. The present invention has the advantages that the single-point detonation enhances the reliability of explosive welding, saves the consumption quantity of dynamite, reduces welding cost and explosive damage action, simplifies welding dynamite distribution technology, makes operation convenient, accelerates welding speed and facilitates outside field welding.
Description
The method for explosive connection welding of rotary thin-wall shells is the invention about two rotary thin-wall shells explosive welding interconnection techniques.
Explosive welding is the extraordinary solder technology that occurs 1950's, compare with general welding method, have easy and simple to handle, speed of welding is fast, cost is low, the characteristics that can weld dissimilar metal, now widely in order to make various ply-metals, multiple tube, bimetallic transit joint, and the welding that is used for various chemical reactors, heat exchanger particular component, as the welding of heat exchanger tube and tube sheet.Explosion welding technique also is used to the connection weldering of heavy caliber revolution shells such as oil pipeline, chemical pipeline.Connect this class revolution shell with explosive welding (EW) and generally all adopt the overlap welding method, overlap joint section between two shells is not long vertically, the body of only requiring explosive welding Duan Nengyu housing equally bears work static load in the future and gets final product, as bear gas-liquid static pressure in the housing, axial tensions etc. are obviously as long as the length of explosive welding section just can satisfy condition of work than thickness of shell is big.But,, just must so that produce the detonation wave of propagating vertically in the explosive, circumferential explosive welding parameter be consistent in the circumferentially whole welding powder charge of simultaneous initiation as the cloth medicine is very short vertically owing to the technical characterstic of explosive welding determines; Than this further method be upwards to adopt the multiple spot simultaneous initiation in week, this needs cloth dot density and axial medicine appearance to work as, so that form annular detonation wave as soon as possible in the welding powder charge.First method need be used linear wave producer, and second method then need use a plurality of synchronous detonators or fuse arming test experiment initiation network just can finish.Linear wave producer is the special shaping explosive of accurately making, to this revolving body, especially in the explosive welding of heavy caliber revolution shell, the explosive payload of linear wave producer often near or greater than the explosive charge of welding main charge bag, this has not only wasted a large amount of high explosives, has increased the explosive welding cost; And, the destruction of blast is strengthened because total explosive charge of welding increases, in many occasions that the explosive charge restriction is arranged, lost possibility of its application.Though adopt the multiple spot simultaneous initiation that total dose is descended to some extent, but make the reliability decrease of explosive welding, the inefficacy in case indivedual point detonates, or bad all may the causing of synchronism welded failure.
The objective of the invention is, design the welding method that a kind of single-point detonates, it not only realizes turning round the complete cycle welding of shell, and the total charge of minimizing explosive welding, reduce welding cost, alleviate the destruction of blast, simplify the cloth pharmaceutical worker skill of explosive welding, improve welding reliability.
Technical solution of the present invention is, lays detonating explosive on the end face that detonates of ring-shaped explosive welding main charge bag, utilizes the explosion velocity difference of two kinds of explosives to adjust the waveform of detonation wave head-on collision point, realizes the detonate complete cycle of welding revolution shell of single-point.
The detonating explosive that lays on the end face that detonates of above-mentioned ring-shaped explosive welding main charge bag is the closed domain, and some single-points detonate arbitrarily on ring.
The detonating explosive that lays on the end face that detonates of above-mentioned ring-shaped explosive welding main charge bag is a length more than or equal to the medicinal strip of 2 times of the axial lengths of main charge bag, and the mid point of medicinal strip is placed on the detonation wave point of impingement place on fire point opposite.
The explosion velocity of the detonating explosive of above-mentioned use is more than or equal to 1.2 times of welding main charge explosion velocity.
Design philosophy of the present invention is, in real work, as adopting homogeneous cloth medicine, single-point detonates, the explosive welding parameter of revolving body complete cycle has only two positions different with circumferential most of zone, and the one, near the fire point, the 2nd, near the fire point opposite detonation wave head-on collision point.Relatively easily satisfy the welding parameter requirement near the fire point, pay parameters such as angle α by adjusting in advance and satisfy welding condition near can more easily making fire point.Therefore, use single-point to detonate and carry out the complete cycle welding, mainly should solve the Welding Problems of detonation wave head-on collision point.Adopt the explosive welding of paying the angle in advance to arrange (referring to accompanying drawing) in the invention, on the end face that detonates of main blasting charge, arrange the detonating explosive ring, or near being clashed a little, detonation arranges the detonating explosive bar, explosion velocity with detonating explosive and main charge is poor, change head-on collision detonation wave waveform, make the detonation wave of head-on collision point become angular impact from normal impact.The explosion velocity of high explosion velocity medicine and the explosion velocity of main charge differ big more, and the detonation wave inclination angle of clashing in the main charge is big more; If it is infinitely great that the explosion velocity of detonating explosive is tending towards, the ripple that crashes in detonation wave head-on collision point main charge will be 180 ° of angles, and this has in fact just formed the end face simultaneous initiation.But real explosion velocity of explosive can not reach infinitely great, and the detonation that clashes like this waveform must be in a certain angle, and its half included angle can be by the explosion velocity D of main charge explosion velocity and high explosion velocity medicine
1Calculate:
Cos φ=D
0/ D
1(1) the head-on collision closing speed D of head-on collision point detonation wave
cFor:
If know the bending angle θ that pays angle α and compound plate (promptly turning round shell 4) in advance, just can utilize the explosive welding theoretical formula to obtain basic compound plate (substrate promptly turns round shell 5) point of impingement translational speed V under the detonation wave point of impingement
c, theoretical as long as V according to explosive welding
cSpeed falls into can weld in the window (less than the material velocity of sound), just can produce welding, so need calculate the V under the detonation wave head-on collision point
cWith basic compound plate impingement angle β be:
Compound plate bending angle approximate replacement when wherein the θ bending angle can be with the common sliding detonation of not considering detonation wave collision supercharging calculates.
The also available formula of the welding parameter at fire point place (3) is calculated, and needs the D in the formula (3) during calculating
cWith main charge explosion velocity D
0Replace.The housing circumferentially explosive welding parameters at other position can calculate with following formula:
tgψ=tgα·sinφ
cosγ=cosθcosψ-sinθsinψsinφ
V
c=D
0sinθ/sinγ (4)
Annotate: ψ, γ are the transition angle in derivation of equation process.
In this explosive welding design, the explosion velocity of two kinds of explosives differs and is the bigger the better in principle, and detonation wave head-on collision angle is big more, and the welding parameter under it between basic compound plate approaches whole circumferential welding parameter more.Has only 7000-8000m/s but the explosion velocity of general high explosive is the highest, and the explosion velocity of welding main charge is generally between 2000-5000m/s, so the explosion velocity difference of two medicines is limited, sometimes must under less explosion velocity difference, select explosive, at this moment should note making detonation wave collision half-angle φ to be not less than 30 °, just two medicine explosion velocity ratios are not less than
Effect of the present invention is: detonates with single-point and realizes the complete cycle welding, and safe and reliable.Specifically be the total charge that (1) has reduced explosive welding, greatly reduce welding cost; (2) since the welding explosive payload reduced many, thereby alleviated the destruction of blast, make this technology can be used for many occasions that the dose restriction is arranged; (3) the cloth pharmaceutical worker who has simplified explosive welding plants, and can reflect the characteristics that explosive welding is easy and simple to handle, speed of welding is fast highlightedly; (4) compare with the multiple spot simultaneous initiation, welding reliability has raising by a relatively large margin, thereby has reached practical purpose more; (5) by the design philosophy decision of being adopted, the present invention is not only applicable to the welding of garden pipe, is applicable to the butt joint of many revolving shells yet, as ellipse, flat annular etc.
Accompanying drawing is implosion and the outer quick-fried welding scheme according to above-mentioned principle design.Wherein:
Fig. 1 is the front view that adopts whole detonating explosive ring to carry out the outsourcing explosive welding.
Label among Fig. 1 is represented, and the 1st, detonating capsule, the 2nd, explosive welding master blasting charge, the 3rd, detonating explosive, the 4th, clad pipe shell (being compound plate), the 5th, basic unit's shell (being substrate), the 6th, plug, α are to pay the angle in advance.
Fig. 2 is the powder charge vertical view that adopts whole detonating explosive ring to carry out the outsourcing explosive welding.
Among Fig. 27 is detonation wave head-on collisions place.
When being quick-fried, on detonation wave head-on collision point, arranges Fig. 3 the front view of high explosion velocity medicinal strip scheme outward.
When being quick-fried, on detonation wave head-on collision point, arranges Fig. 4 the powder charge vertical view of high explosion velocity medicinal strip outward.
When being implosion, adopts Fig. 5 the front view of whole detonating explosive ring scheme.
Among Fig. 58 is that momentum absorbs ring.
When being implosion, adopts Fig. 6 the powder charge vertical view of whole detonating explosive ring.
When being implosion, on detonation wave head-on collision point, arranges Fig. 7 the front view of high explosion velocity medicinal strip scheme.
When being implosion, on detonation wave head-on collision point, arranges Fig. 8 the powder charge vertical view of high explosion velocity medicinal strip.
Above-mentioned accompanying drawing 1,2 and Fig. 4, the 5th adopt whole detonating explosive ring to adjust the detonation waveform, and accompanying drawing 3,4 and Fig. 7, the 8th arrange high explosion velocity medicinal strip on detonation wave head-on collision point, utilize local explosion velocity difference to adjust the head-on collision waveform of detonation wave.
For further specifying the present invention, as follows especially exemplified by embodiment.
Example 1
With wall thickness is mild steel conical shell and the diameter of 3mm
The J55 petroleum casing pipe of inch carries out lap seal, adopts the outer quick-fried Type of Welding as accompanying drawing 1,2.Arrange nearly (RDX) powder of the thick black rope of 8mm as the main blasting charge of welding on 3mm carbon steel shell, the explosive height is 50mm, the density p ≈ 0.98/cm of RDX powder
3, explosion velocity D
0Be about 5400m/s, getting mass ratio as calculated is R=0.31, final bending angle θ=5.5 °, compound plate flying speed V
p=518m/s.Adopt the primacord ring as the detonating explosive ring that detonates, its explosion velocity D
1=6900m/s, application formula (1), (2) can get φ=38.5 °, D
c=8674m/s.The angle of paying in advance between 3mm conical shell and petroleum casing pipe is 1: 5 gradient, and α=11.3 ° can be obtained by formula (3), and the welding parameter under the detonation wave head-on collision point is:
V
p=518m/s, V
c=2877m/s, the explosive welding parameter at fire point place is:
V
p=518m/s, V
c=1791m/s, can obtaining circumferentially with formula (4), the welding parameter at other position is:
V
p=518m/s, V
cAll in the welded window of carbon steel, after the enforcement explosive welding, the whole good welds that circumferentially all produces is about welding and assembling height average out to 40mm for=2628m/s, above-mentioned parameter.
Example 2
The explosive welding of employing shown in accompanying drawing 3,4 arranges that adopting primacord is semi-ring as high explosion velocity medicinal strip, and mid point is arranged in the opposite of fire point, and other welding parameter is identical with example 1.It is as follows to calculate explosive welding parameter:
Head-on collision point place: V
p=518m/s, V
c=2877m/s,
Fire point place: V
p=518m/s, V
c=1791m/s,
Cloth primacord section: V
p=518m/s, V
c=2628m/s,
End cloth primacord section is by formula (4), establishes φ=90 °, calculates welding parameter and is:
V
p=518m/s,V
c=2374m/s。
After implementing explosive welding, whole circumferential welding is good, and average welding and assembling height is about 40mm.
Through the explosive welding experiment as seen, the fire point place, and circumferential other positions of the Type of Welding at the detonation wave point of impingement place relative and housing with fire point different, the basic compound plate collision welding at fire point and detonation wave point of impingement place is vertically, and explosive welding ripple trend forms vertically; And the welded closed face at other positions of housing is to be not orthogonal to the welding of axial angular impact, and the trend of welding ripple becomes the inclination angle with axial.
Claims (4)
1. the method for explosive connection welding of rotary thin-wall shells, it is characterized in that on the end face that detonates of ring-shaped explosive welding main charge bag, laying detonating explosive, utilize the waveform of the explosion velocity difference adjustment detonation wave head-on collision point of two kinds of explosives, the realization single-point detonates and welds the complete cycle that turns round shell.
2. the method for explosive connection welding of rotary thin-wall shells according to claim 1 is characterized in that, the detonating explosive that lays on the end face that detonates of above-mentioned ring-shaped explosive welding main charge bag is the closed domain, and some single-points detonate arbitrarily on ring.
3. the method for explosive connection welding of rotary thin-wall shells according to claim 1, it is characterized in that, the detonating explosive that lays on the end face that detonates of explosive welding annular main charge bag, be the medicinal strip of length more than or equal to 2 times of main charge bag axial lengths, the mid point of medicinal strip is placed on the detonation wave point of impingement place on fire point opposite.
4. according to the method for explosive connection welding of claim 1 or 2 or 3 described rotary thin-wall shells, the explosion velocity that it is characterized in that employed detonating explosive is more than or equal to 1.2 times of welding main charge explosion velocity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98107285 CN1073904C (en) | 1998-04-07 | 1998-04-07 | Method for explosive connection welding rotary thin-wall shells |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98107285 CN1073904C (en) | 1998-04-07 | 1998-04-07 | Method for explosive connection welding rotary thin-wall shells |
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| Publication Number | Publication Date |
|---|---|
| CN1193562A CN1193562A (en) | 1998-09-23 |
| CN1073904C true CN1073904C (en) | 2001-10-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98107285 Expired - Fee Related CN1073904C (en) | 1998-04-07 | 1998-04-07 | Method for explosive connection welding rotary thin-wall shells |
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| Country | Link |
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| CN (1) | CN1073904C (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110340237B (en) * | 2019-06-27 | 2020-09-15 | 武汉理工大学 | Impact progressive connection process for dissimilar metal pipes |
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1998
- 1998-04-07 CN CN 98107285 patent/CN1073904C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1193562A (en) | 1998-09-23 |
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