CN106845125B - A kind of calculation method of the protection gas minimum of gas shielded arc welding - Google Patents
A kind of calculation method of the protection gas minimum of gas shielded arc welding Download PDFInfo
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- CN106845125B CN106845125B CN201710071605.3A CN201710071605A CN106845125B CN 106845125 B CN106845125 B CN 106845125B CN 201710071605 A CN201710071605 A CN 201710071605A CN 106845125 B CN106845125 B CN 106845125B
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Abstract
The present invention provides a kind of calculation method of the protection gas minimum of gas shielded arc welding, comprising the following steps: determines effective protection range d firstg, including pool width dmp, fusion sector width dhaWidth d is reserved with crosswind is resistedw.Pass through effective protection range dgWith nozzle diameter dnWith the relationship of range h, nozzle diameter d is calculatedn.In turn, determine that welding transient state stops shortest time t according to parametermin, then pass through effective protection range radial direction minimum flow velocity vcfShortest time t is stopped with welding transient stateminRelationship, the range that is effectively protected radial direction minimum flow velocity vcf.Finally, comparing effective protection range radial direction minimum flow velocity vcfWith crosswind speed vcwSize, determine gas flow rate v in required different nozzlesw, area of section then is sprayed multiplied by nozzle, to obtain the minimum discharge of protection gas.This method model is simple, and the minimum amount of protection gas required for being calculated according to known parameters reduces resource consumption to avoid excessively using, and reduces manufacturing cost.
Description
Technical field
The invention belongs to welding technology fields, more particularly, to a kind of calculating side of the protection gas minimum of gas shielded arc welding
Method.
Background technique
Gas shielded arc welding is using electric arc as heat source, fusion welding of the gas as protection medium.In the welding process.It protects
Shield gas forms gas blanket around electric arc, and electric arc, molten bath and air are separated, the influence of pernicious gas is prevented, and is protected
Demonstrate,prove arc stability burning.It can adapt to the needs of different metal material and welding procedure by the mixed gas that gas with various forms,
And optimal protecting effect, excellent arc characteristic and sufficiently stable melt-extracted steel fibre can be obtained, than with pure gas more
It is easy to get to good welding result.
Current gas protection weldering protection gas dosage is substantially empirical extensive gas supply, largely uses hybrid protection
Gas.When actual welding, what can be shielded is a small amount of gas, a large amount of that gas is protected to be wasted.Influence protection gas dosage
Principal element there are three aspect, ambient side wind velocity, range and pool width.Ambient side wind velocity, when protective gas is sprayed onto
Diffusion velocity on workpiece surface around should be greater than crosswind speed.Range is distance of the nozzle lower surface to weld pool surface, too
It is too small greatly all to reduce protecting effect, production efficiency.The punching area of pool width, protection gas to workpiece surface should be wrapped sufficiently
Molten bath is covered, the too small protection of covering amount is insufficient, and gas is protected in the excessive waste of covering amount.
Summary of the invention
For in traditional gas protection weldering, based on empirically determined protection gas dosage situation bigger than normal, protection gas is proposed
The New calculating method of the minimum of dosage.In the welding process, protection gas should sufficiently cover welding region.It determines first effectively
Protection scope dg, including pool width dmp, fusion sector width dhaWidth d is reserved with crosswind is resistedw.Then according to effective protection model
Enclose dgWith nozzle diameter dnWith the relationship of range h, nozzle diameter d is calculatedn.Then, determine that welding transient state stops most according to parameter
Short time tmin, according to effective protection range radial direction minimum flow velocity vcfShortest time t is stopped with welding transient stateminRelationship, obtain
Effective protection range radial direction minimum flow velocity vcf.Finally, comparing effective protection range radial direction minimum flow velocity vcfWith crosswind speed vcw's
Size determines gas flow rate v in different nozzlesw, area of section then is sprayed multiplied by nozzle, to obtain protection gas most
Small flow.
What the present invention is realized by following scheme: a kind of calculation method of the protection gas minimum of gas shielded arc welding, including
Following steps:
Step S1: gas effective protection range d is determined firstg, pass through gas effective protection range dgWith nozzle diameter dn
With the relationship of range h, nozzle diameter d is calculatedn, wherein
dg=dmp+dha+dw (1)
D in formula (1)mpPool width, dhaFuse sector width, dwIt resists crosswind and reserves width,
dmp=φ × B (2)
φ-weld seam width-thickness ratio in formula (2), B- apparent throat,
In formula (3), dwIt resists crosswind and reserves width, h- range, maximum nozzle height value specified in H- industry, vcwSide
Wind velocity,
In formula (4), dnNozzle diameter, dg-Gas effective protection range, h- range；
Step S2: determine that welding transient state stops shortest time t according to parametermin, then it is radial most by effective protection range
Small flow velocity vcfShortest time t is stopped with welding transient stateminRelationship, the range that is effectively protected radial direction minimum flow velocity vcf, wherein
In formula (5), vmaxThe welding maximum speed summarized the experience in industry, tminIt welds transient state and stops shortest time, s-
Transient state welds distance,
In formula (6), vcfEffective protection range radial direction minimum flow velocity, dg-Gas effective protection range, dnNozzle diameter；
Step S3: compare effective protection range radial direction minimum flow velocity vcfWith crosswind speed vcwSize, determine required
Gas flow rate v in different nozzlesw, area of section then is sprayed multiplied by nozzle, to obtain the minimum discharge of protection gas.
In above scheme, the width d of the fusion areahaFor 0.8~1.2mm.
In above scheme, when the range h value is 10~15mm, welding current≤200A；Range h value be 15~
When 20mm, 200~350A of welding current；When range h value is 20~25mm, 350~500A of welding current.
In above scheme, effective protection range radial direction minimum flow velocity v in the step S3cfGreater than crosswind speed vcwWhen, spray
Gas flow rate v in mouthwWith effective protection range radial direction minimum flow velocity vcfRelationship such as formula (7) shown in:
In above scheme, effective protection range radial direction minimum flow velocity v in the step S3cfLess than crosswind speed vcwWhen, spray
Gas flow rate v in mouthwWith crosswind speed vcwRelationship such as formula (10) shown in:
In above scheme, Minimal Protective throughput in the step S3Wherein reFor welding wire half
Diameter.
Compared with prior art, it the beneficial effects of the present invention are: this method model is simple, can be counted according to known parameters
The minimum amount of protection gas required for calculating reduces resource consumption to avoid excessively using, and reduces manufacturing cost.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention.
In figure: 1- nozzle, 2- welding wire, 3- protection air-flow field, 4- corresponding circle of sensation, the molten bath 5-, 6- base material.
Specific embodiment
Present invention will be further explained with reference to the attached drawings and specific examples, but protection scope of the present invention is simultaneously
It is without being limited thereto.
Fig. 1 show a kind of embodiment of the calculation method of the protection gas minimum of gas shielded arc welding of the present invention,
Nozzle 1 is located at the surface in molten bath 5 in figure, and for welding wire 2 against molten bath 5, the gas that nozzle 1 sprays forms protection air-flow field 3, fusion
The position that area 4 is located at molten bath 5 and base material 6 connects.In the welding process, protection gas should sufficiently cover welding region.This method is first
First determine effective protection range dg, including pool width dmp, fusion sector width dhaWidth d is reserved with crosswind is resistedw.Then root
According to effective protection range dgWith nozzle diameter dnWith the relationship of range h, nozzle diameter d is calculatedn.Then, it is determined and is welded according to parameter
It connects transient state and stops shortest time tmin, according to effective protection range radial direction minimum flow velocity vcfShortest time t is stopped with welding transient statemin
Relationship, the range that is effectively protected radial direction minimum flow velocity vcf.Finally, comparing effective protection range radial direction minimum flow velocity vcfWith
Crosswind speed vcwSize, determine gas flow rate v in different nozzlesw, area of section then is sprayed multiplied by nozzle, thus
To the minimum discharge of protection gas.
Determine the diameter of nozzle:
Determine protective gas effective protection range dg, effective protection range dgIncluding pool width dmp, fusion sector width dha
Width d is reserved with crosswind is resistedw, shown in relationship such as formula (1).
dg=dmp+dha+dw (1)
Shown in the relationship of pool width and apparent throat such as formula (2)
dmp=φ × B (2)
φ-weld seam width-thickness ratio, B- apparent throat in formula.
Weld seam is the fusion area welded, the width d of fusion area with the junctional area of base materialhaGeneral very narrow, generally 1mm is left
It is right.
It resists crosswind and reserves width dwWith shown in the relationship of range and crosswind speed such as formula (3)
In formula, dwIt resists crosswind and reserves width, h- range, maximum nozzle height value specified in H- industry, vcwCrosswind
Speed.
Range h value, 10~15mm, welding current≤200A；15~20mm, 200~350A of welding current；20~
25mm, 350~500A of welding current.
Nozzle diameter dn, range and effective protection range correlativity, as shown in formula (4).
In formula, dnNozzle diameter, dgGas effective protection range, h- range.
According to (1), (2), (3), (4) are shown, nozzle diameter d required for being calculated according to relevant parametern。
Determine nozzle fluid velocity:
It welds transient state and stops shortest time and welding maximum speed relationship, as shown in formula (5)
In formula, vmaxThe welding maximum speed summarized the experience in industry, tminIt welds transient state and stops shortest time, s- transient state
Weld distance.Transient state welding distance s according to the actual situation approximate can take the diameter of welding wire surely.
Effective protection range radial direction minimum flow velocity vcfShortest time t is stopped with welding transient stateminShown in relationship such as formula (6)
In formula, vcfEffective protection range radial direction minimum flow velocity, dg-Gas effective protection range, dnNozzle diameter.
Calculate protection gas minimum discharge:
As effective protection range radial direction minimum flow velocity vcfGreater than crosswind speed vcwWhen, gas flow rate v in nozzlewIt is protected with effective
Protect range radial direction minimum flow velocity vcfRelationship such as formula (7) shown in
Under the operating condition, if vcf≥vcw, protect gas minimum discharge QminFor
Wherein
R in formulaeWelding wire radius.
As effective protection range radial direction minimum flow velocity vcfLess than crosswind speed vcwWhen, gas flow rate v in nozzlewWith crosswind speed
Spend vcwRelationship such as formula (10) shown in.
Thus under the operating condition, vcf<vcwWhen, protect gas minimum discharge QminFor
The embodiment is a preferred embodiment of the present invention, but present invention is not limited to the embodiments described above, not
In the case where substantive content of the invention, any conspicuous improvement that those skilled in the art can make, replacement
Or modification all belongs to the scope of protection of the present invention.
Claims (6)
1. a kind of calculation method of the protection gas minimum of gas shielded arc welding, which comprises the following steps:
Step S1: gas effective protection range d is determined firstg, pass through gas effective protection range dgWith nozzle diameter dnAnd target
Relationship away from h calculates nozzle diameter dn, wherein
dg=dmp+dha+dw (1)
D in formula (1)mpPool width, dhaFuse sector width, dwIt resists crosswind and reserves width,
dmp=φ × B (2)
φ-weld seam width-thickness ratio in formula (2), B- apparent throat,
In formula (3), dwIt resists crosswind and reserves width, h- range, maximum nozzle height value specified in H- industry, vcwCrosswind speed
Degree,
In formula (4), dnNozzle diameter, dgGas effective protection range, h- range；
Step S2: determine that welding transient state stops shortest time t according to parametermin, then pass through effective protection range radial direction minimum stream
Fast vcfShortest time t is stopped with welding transient stateminRelationship, the range that is effectively protected radial direction minimum flow velocity vcf, wherein
In formula (5), vmaxThe welding maximum speed summarized the experience in industry, tminIt welds transient state and stops shortest time, s- transient state
Distance is welded,
In formula (6), vcfEffective protection range radial direction minimum flow velocity, dg-Gas effective protection range, dnNozzle diameter；
Step S3: compare effective protection range radial direction minimum flow velocity vcfWith crosswind speed vcwSize, determine required difference
Nozzle in gas flow rate vw, area of section then is sprayed multiplied by nozzle, to obtain the minimum discharge of protection gas.
2. the calculation method of the protection gas minimum of gas shielded arc welding according to claim 1, which is characterized in that described molten
Close the width d in areahaFor 0.8~1.2mm.
3. the calculation method of the protection gas minimum of gas shielded arc welding according to claim 1, which is characterized in that the target
Away from h value be 10~15mm when, welding current≤200A；When range h value is 15~20mm, 200~350A of welding current；Target
Away from h value be 20~25mm when, 350~500A of welding current.
4. the calculation method of the protection gas minimum of gas shielded arc welding according to claim 1, which is characterized in that the step
Effective protection range radial direction minimum flow velocity v in rapid S3cfGreater than crosswind speed vcwWhen, gas flow rate v in nozzlewWith effective protection model
Girth diameter is to minimum flow velocity vcfRelationship such as formula (7) shown in:
。
5. the calculation method of the protection gas minimum of gas shielded arc welding according to claim 4, which is characterized in that the step
Effective protection range radial direction minimum flow velocity v in rapid S3cfLess than crosswind speed vcwWhen, gas flow rate v in nozzlewWith crosswind speed
vcwRelationship such as formula (10) shown in:
。
6. the calculation method of the protection gas minimum of gas shielded arc welding according to claim 1 or 4 or 5, which is characterized in that
Minimal Protective throughput in the step S3Wherein reFor welding wire radius.
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| CN201710071605.3A CN106845125B (en) | 2017-02-09 | 2017-02-09 | A kind of calculation method of the protection gas minimum of gas shielded arc welding |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102218585A (en) * | 2011-05-11 | 2011-10-19 | 中国海洋大学 | Welding method and device for cold arc welding of gas shielded welding of thin plate |
| CN102814576A (en) * | 2012-09-05 | 2012-12-12 | 中国化学工程第十四建设有限公司 | Argon-rich carbon dioxide arc welding method |
-
2017
- 2017-02-09 CN CN201710071605.3A patent/CN106845125B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102218585A (en) * | 2011-05-11 | 2011-10-19 | 中国海洋大学 | Welding method and device for cold arc welding of gas shielded welding of thin plate |
| CN102814576A (en) * | 2012-09-05 | 2012-12-12 | 中国化学工程第十四建设有限公司 | Argon-rich carbon dioxide arc welding method |
Non-Patent Citations (3)
| Title |
|---|
| A computational fluid dynamic analysis of the effect of side draughts and nozzle diameter on shielding gas coverage during gas metal arc welding;G.M.Ramsey,et al;《Journal of Materials Processing Technology》;20120328;第212卷(第8期);第1694-1699页 |
| A Computational Fluid Dynamic Analysis Of The Effect Of Weld Nozzle Geometry Changes On Shielding Gas Coverage During Gas Metal Arc Welding;Campbel,S.W,et al;《Journal of Manufacturing Science and Engineering》;20131031;第135卷(第5期);第0-32页 |
| 用于气体保护焊的自动混气设备;李钦奉 等;《焊接》;20051025(第10期);第65-67页 |
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