CA1171467A - Flexible shield for restraining untraviolet radiation from mig welding arc - Google Patents
Flexible shield for restraining untraviolet radiation from mig welding arcInfo
- Publication number
- CA1171467A CA1171467A CA000391541A CA391541A CA1171467A CA 1171467 A CA1171467 A CA 1171467A CA 000391541 A CA000391541 A CA 000391541A CA 391541 A CA391541 A CA 391541A CA 1171467 A CA1171467 A CA 1171467A
- Authority
- CA
- Canada
- Prior art keywords
- shroud
- torch
- arc
- ultraviolet light
- support means
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
Case 2780 SHIELDING DEVICE FOR RESTRAINING
ULTRAVIOLET RADIATION
ABSTRACT OF THE DISCLOSURE
There is provided a novel mechanical shielding device for restraining ultraviolet light radiated from an arc of a metal-inert-gas welding torch. The shielding device includes a support member which is secured to the welding torch. The shielding device further includes a flexible metallic shroud.
The shroud surrounds the arc and contacts the parent metal being welded. The shroud is partially impervious to ultraviolet light and, when used in conjunction with the parent metal and the torch, defines a substantially enclosed area whereby generation of ozone is restricted beyond this area.
ULTRAVIOLET RADIATION
ABSTRACT OF THE DISCLOSURE
There is provided a novel mechanical shielding device for restraining ultraviolet light radiated from an arc of a metal-inert-gas welding torch. The shielding device includes a support member which is secured to the welding torch. The shielding device further includes a flexible metallic shroud.
The shroud surrounds the arc and contacts the parent metal being welded. The shroud is partially impervious to ultraviolet light and, when used in conjunction with the parent metal and the torch, defines a substantially enclosed area whereby generation of ozone is restricted beyond this area.
Description
'7 Case 2780 SHIELDING DEVICE FOR RESTRAINING
.
ULTRAVIOLET RADIATION
The present invention relates to a mechanical shielding device for restraining ultraviolet light radiated from an arc of a metal-inert-gas welding torch.
It is well known that metal-inert-gas ~MIG~
welding of aluminum results in the formation of ozone. ultraviolet light radiated from the electric arc reacts with oxygen to produce the ozone. For the most part, the ozone is generated close to the arc and atenuates rapidly as the distance from the arc ncreasesO
Because ozone is a severe respiratory irritant, and at low levels can promote significant ~ irritation of mucous membranes of the eyes, nose, and ;15 throat, it can be seen that there is a need to reduce the` hazardous effects due to ozone.
In the past one method of reducing the amount of ozone generated was to surround the arc with a glass or acrylic shield. The problem with such a shield, however,~was that the shield could not ~; withstand the high temperatures generated near the arc. Thus,~ for this type of shielding to be successful the~shield would have to be excessively large and this would result in it being impractical to use. Glass shields further suffered from breakage. Thus there is a need for a practical mechanical shield to be developed which minimizes the ' production of ozone and is not subject to easy : .
-' Case 2780 breakage.
Accordingly it is an object of the present invention to provide a mechanical shielding device that reduces the produc~ion of ozone in a MIG welding process and is not subject -to breakage.
Briefly the present invention provides a mechanical sheilding device for restraining ultraviolet light radiated from an arc of a MIG
welding torch. The device includes a support means which is adapted to be secured to the torch. The device further includes a flexible shroud which is at least partially impervious to ultraviolet light. The shroud is supported from the support means and surrounds the arc. Further, the shroud will contact the parent metal when the support means is secured to the torch and when in use. The shroud when used in conjunction with the parent metal and the torch defines a substantially enclosed area beyond which transmission of ozone is restricted~ Because the shroud comprises a flexible material it will not be readily subject to breakage and may be used in most practical MIG welding applications~ While the shielding device may be readily used for automatic MIG
welding, it should be understood that this shielding device also finds application in manual welding.
Additionally, the support means of the shielding device may comprise a disk shaped member having a central aperture into which the welding torch is fitted. The disk will have a downwardly depending cyclindrical flange on its periphery about which the shroud is positioned and attached thereto by suitable means. The material for the shroud may be any suitable flexible material which can withstand the high temperatures associated with the arc. One such suitable material, for example, would be stainless steel.
Furthermore, the shroud may include a viewing port through which an operator may monitor 4~;~7 Case 2780 the arc and weld puddle. This viewing port may comprise a portion cut away from the shielding device. Such a viewing por-t in this instance would not be impervious to ultraviolet light, the size of the viewing port however, would be chosen such that the amount of ultraviolet light escaping would be insufficient to produce a hazardous amount of ozone.
For better understanding of the nature an objects of the present invention, reference may be had by way of example to the accompanying diagrammatic drawings of the preferred embodiment of the present invention in which:
Figure 1 shows a perspective view of a manual welding torch including the shielding device attached to the torch;
Figure 2 is an elevational view illustrating the shielding device;
Figure 3 is a sectional view of the shroud taken at section 3-3 of Figure 2.
Referring now to the drawings there is shown a welding torch 10 of a MIG welder having the wire 12 to be welded entering through a rear portion of the torch 10. Electricity is provided to the MIG welder by electrical power lines 14. Shielding gas is provided to the vicinity of the weId by passing through the torch and the gas enters the torch through tubing 16. Secured to the torch is a mechanical flexible shielding device 18. Shielding device 18 surrounds the arc 20 and, together with the aluminum parent metal 22 being welded, defines an enclosed area which restricts the transmission of ozone beyond that area.
The mechanical shielding device comprises a support means 24 and a flexible shroud 26. The support means 24 comprises a metallic disk shaped member 28 which is provided with a downwardly depending cylindrical flange 30 on its peripheral edge (see , ~7~
Case 2780 _aS_ figure 1). Surrounding flange 30 is the flexible shroud 26. The flexible shroud 26 is clamped to flange 30 by suitable means such as the pipe clamp 32 illustrated in the figures of the preferred embodiment.
The cylindrical flange 30 is provided with a central aperture 34 which surrounds a portion of torch 10.
Brazed to flange 30 adjacent aperture 34 are a plurality of nuts 36 through which screws 38 pass to secure the support member to the torch.
The shroud 26 comprises a plurality of layers of metallic metal chain link. These layers are shown to comprise three layers in Figure 3. The more layers used the more impervious the metallic shroud will be to the transmission of ultraviolet light~ In the preferred embodiment illustrated, three layers are used because this number of layers is sufficient to effectively reduce the transmission of ozone beyond the area defined by the shroud, the support means and parent metal to an accpetable and safe level. As stated previously, in the preferred embodiment, stainless steel is employed; however~ it should be understood that any material which can withstand the high temperature of the weld, which i5 impervious to transmission of ultraviolet light and which is flexible may be used.
As illustrated in Figure 2, a viewing port is provided at 40. Viewing port 40 is formed by cutting a knotched aperture out from the shroud.
Accordingly, this portion of the shielding device (the viewing port) is not impervious to the transmission of ultraviolet light~ The size of the viewing port however, is chosen such that the operator may adequately view the arc and the weld puddle. The size chosen should not result in significant amounts of ozone being transmitted.
It should be understood that alternate embodiments may be readily apparent to a man skilled Case 2780 in the art in view of the foregoing disclosure.
Accordinly, the scope of the present invention ~hould only be limited to that which is claimed in the accompanying claims.
.
.
ULTRAVIOLET RADIATION
The present invention relates to a mechanical shielding device for restraining ultraviolet light radiated from an arc of a metal-inert-gas welding torch.
It is well known that metal-inert-gas ~MIG~
welding of aluminum results in the formation of ozone. ultraviolet light radiated from the electric arc reacts with oxygen to produce the ozone. For the most part, the ozone is generated close to the arc and atenuates rapidly as the distance from the arc ncreasesO
Because ozone is a severe respiratory irritant, and at low levels can promote significant ~ irritation of mucous membranes of the eyes, nose, and ;15 throat, it can be seen that there is a need to reduce the` hazardous effects due to ozone.
In the past one method of reducing the amount of ozone generated was to surround the arc with a glass or acrylic shield. The problem with such a shield, however,~was that the shield could not ~; withstand the high temperatures generated near the arc. Thus,~ for this type of shielding to be successful the~shield would have to be excessively large and this would result in it being impractical to use. Glass shields further suffered from breakage. Thus there is a need for a practical mechanical shield to be developed which minimizes the ' production of ozone and is not subject to easy : .
-' Case 2780 breakage.
Accordingly it is an object of the present invention to provide a mechanical shielding device that reduces the produc~ion of ozone in a MIG welding process and is not subject -to breakage.
Briefly the present invention provides a mechanical sheilding device for restraining ultraviolet light radiated from an arc of a MIG
welding torch. The device includes a support means which is adapted to be secured to the torch. The device further includes a flexible shroud which is at least partially impervious to ultraviolet light. The shroud is supported from the support means and surrounds the arc. Further, the shroud will contact the parent metal when the support means is secured to the torch and when in use. The shroud when used in conjunction with the parent metal and the torch defines a substantially enclosed area beyond which transmission of ozone is restricted~ Because the shroud comprises a flexible material it will not be readily subject to breakage and may be used in most practical MIG welding applications~ While the shielding device may be readily used for automatic MIG
welding, it should be understood that this shielding device also finds application in manual welding.
Additionally, the support means of the shielding device may comprise a disk shaped member having a central aperture into which the welding torch is fitted. The disk will have a downwardly depending cyclindrical flange on its periphery about which the shroud is positioned and attached thereto by suitable means. The material for the shroud may be any suitable flexible material which can withstand the high temperatures associated with the arc. One such suitable material, for example, would be stainless steel.
Furthermore, the shroud may include a viewing port through which an operator may monitor 4~;~7 Case 2780 the arc and weld puddle. This viewing port may comprise a portion cut away from the shielding device. Such a viewing por-t in this instance would not be impervious to ultraviolet light, the size of the viewing port however, would be chosen such that the amount of ultraviolet light escaping would be insufficient to produce a hazardous amount of ozone.
For better understanding of the nature an objects of the present invention, reference may be had by way of example to the accompanying diagrammatic drawings of the preferred embodiment of the present invention in which:
Figure 1 shows a perspective view of a manual welding torch including the shielding device attached to the torch;
Figure 2 is an elevational view illustrating the shielding device;
Figure 3 is a sectional view of the shroud taken at section 3-3 of Figure 2.
Referring now to the drawings there is shown a welding torch 10 of a MIG welder having the wire 12 to be welded entering through a rear portion of the torch 10. Electricity is provided to the MIG welder by electrical power lines 14. Shielding gas is provided to the vicinity of the weId by passing through the torch and the gas enters the torch through tubing 16. Secured to the torch is a mechanical flexible shielding device 18. Shielding device 18 surrounds the arc 20 and, together with the aluminum parent metal 22 being welded, defines an enclosed area which restricts the transmission of ozone beyond that area.
The mechanical shielding device comprises a support means 24 and a flexible shroud 26. The support means 24 comprises a metallic disk shaped member 28 which is provided with a downwardly depending cylindrical flange 30 on its peripheral edge (see , ~7~
Case 2780 _aS_ figure 1). Surrounding flange 30 is the flexible shroud 26. The flexible shroud 26 is clamped to flange 30 by suitable means such as the pipe clamp 32 illustrated in the figures of the preferred embodiment.
The cylindrical flange 30 is provided with a central aperture 34 which surrounds a portion of torch 10.
Brazed to flange 30 adjacent aperture 34 are a plurality of nuts 36 through which screws 38 pass to secure the support member to the torch.
The shroud 26 comprises a plurality of layers of metallic metal chain link. These layers are shown to comprise three layers in Figure 3. The more layers used the more impervious the metallic shroud will be to the transmission of ultraviolet light~ In the preferred embodiment illustrated, three layers are used because this number of layers is sufficient to effectively reduce the transmission of ozone beyond the area defined by the shroud, the support means and parent metal to an accpetable and safe level. As stated previously, in the preferred embodiment, stainless steel is employed; however~ it should be understood that any material which can withstand the high temperature of the weld, which i5 impervious to transmission of ultraviolet light and which is flexible may be used.
As illustrated in Figure 2, a viewing port is provided at 40. Viewing port 40 is formed by cutting a knotched aperture out from the shroud.
Accordingly, this portion of the shielding device (the viewing port) is not impervious to the transmission of ultraviolet light~ The size of the viewing port however, is chosen such that the operator may adequately view the arc and the weld puddle. The size chosen should not result in significant amounts of ozone being transmitted.
It should be understood that alternate embodiments may be readily apparent to a man skilled Case 2780 in the art in view of the foregoing disclosure.
Accordinly, the scope of the present invention ~hould only be limited to that which is claimed in the accompanying claims.
.
Claims (7)
1. A mechanical sheilding device for restraining ultraviolet light radiated from an arc of a metal-inert-gas welding torch, said device comprising: a support means adapted to be secured to said torch, and a flexible shroud at least partially impervious to said ultraviolet light supported from said support means for surrounding said arc and contacting a parent metal when said support means is secured to said torch, said shroud being operable in conjunction with said parent metal and said torch to define a substantially enclosed area whereby trans-mission of ozone is restricted beyond said enclosed area.
2. The device of Claim 1 wherein said shroud comprises a metallic material.
3. The device of Claim 1 wherein said shroud comprises one or more layers of a metallic mesh
4. The device of Claim 3 wherein said mesh comprises a plurality of chain links interconnected together.
5. The device of Claim 1 wherein said shroud includes a viewing port through which an operator may monitor the arc and weld puddle.
6. The device of Claim 5 wherein said viewing port is not impevious to ultraviolet light.
7. The device of Claim 1 wherein said support means includes: a disk shaped member having a central aperture into which said welding torch is fitted, said disk having a downwardly depending cylindrical flange on its periphery about which said - 7 - Case 2780
7. The device of Claim 1 wherein said support means includes: a disk shaped member having a central aperture into which said welding torch is fitted, said disk having a downwardly depending cylindrical flange on its periphery about which said - 7 - Case 2780
Claim 7 continued:
shroud is positioned; and, means for attaching said shroud to said cylindrical flange.
shroud is positioned; and, means for attaching said shroud to said cylindrical flange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000391541A CA1171467A (en) | 1981-12-04 | 1981-12-04 | Flexible shield for restraining untraviolet radiation from mig welding arc |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000391541A CA1171467A (en) | 1981-12-04 | 1981-12-04 | Flexible shield for restraining untraviolet radiation from mig welding arc |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1171467A true CA1171467A (en) | 1984-07-24 |
Family
ID=4121560
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000391541A Expired CA1171467A (en) | 1981-12-04 | 1981-12-04 | Flexible shield for restraining untraviolet radiation from mig welding arc |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1171467A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0799666A1 (en) * | 1996-04-03 | 1997-10-08 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Process and apparatus for reducing the emission of ozone produced during a gas shielded arc welding operation |
| CN110153420A (en) * | 2019-06-04 | 2019-08-23 | 航发优材(镇江)增材制造有限公司 | A kind of titanium alloy protection cabin device and laser gain material manufacturing method |
-
1981
- 1981-12-04 CA CA000391541A patent/CA1171467A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0799666A1 (en) * | 1996-04-03 | 1997-10-08 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Process and apparatus for reducing the emission of ozone produced during a gas shielded arc welding operation |
| FR2747064A1 (en) * | 1996-04-03 | 1997-10-10 | Air Liquide | METHOD AND DEVICE FOR REDUCING OZONE EMISSIONS PRODUCED DURING ARC WELDING OPERATION WITH PROTECTIVE GAS |
| CN110153420A (en) * | 2019-06-04 | 2019-08-23 | 航发优材(镇江)增材制造有限公司 | A kind of titanium alloy protection cabin device and laser gain material manufacturing method |
| CN110153420B (en) * | 2019-06-04 | 2024-05-14 | 航发优材(镇江)增材制造有限公司 | Titanium alloy protection cabin device and laser additive manufacturing method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEC | Expiry (correction) | ||
| MKEX | Expiry |