CA1150778A - Arc gouging torch with carbon electrode and air pressure biased nozzle body - Google Patents
Arc gouging torch with carbon electrode and air pressure biased nozzle bodyInfo
- Publication number
- CA1150778A CA1150778A CA000341365A CA341365A CA1150778A CA 1150778 A CA1150778 A CA 1150778A CA 000341365 A CA000341365 A CA 000341365A CA 341365 A CA341365 A CA 341365A CA 1150778 A CA1150778 A CA 1150778A
- Authority
- CA
- Canada
- Prior art keywords
- torch
- electrode
- nozzle
- arc gouging
- nozzle body
- 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
Landscapes
- Arc Welding In General (AREA)
Abstract
11,337 ARC GOUGING TORCH WITH CARBON ELECTRODE
AND AIR PRESSURE BIASED NOZZLE BODY
ABSTRACT
The torch has a hollow torch body through which an electrode passes and a pivotally connected front end assembly having an electrode nozzle mounted at the outer end thereof. The front end assembly forms a plenum chamber about the electrode through which air is passed for urging the nozzle in electrical contract with the electrode. A spring loaded pressure roll assembly loads the electrode against the drive roll within the hollow torch body.
S P E C I F I C A T I O N
_ _ _ _ _ _ _ _ _ _ _
AND AIR PRESSURE BIASED NOZZLE BODY
ABSTRACT
The torch has a hollow torch body through which an electrode passes and a pivotally connected front end assembly having an electrode nozzle mounted at the outer end thereof. The front end assembly forms a plenum chamber about the electrode through which air is passed for urging the nozzle in electrical contract with the electrode. A spring loaded pressure roll assembly loads the electrode against the drive roll within the hollow torch body.
S P E C I F I C A T I O N
_ _ _ _ _ _ _ _ _ _ _
Description
11,3 ~ 7~ ~
BACKGROUND OF THE INVENTION
The present invention relates to automatic arc gouging machines and more particu7arly to an automatic arc gouging torch.
The automatic arc gouging process is carried out by feeding an elongated carbon electrode through an arc gouging torch into contact with the workpiece, striking an arc, and then while the electrode is being consumed, automatically controlling the electrode feed ` 10 rate in order to maintain a constant distance between the tip of the electrode and the workpiece. The arc thus established between the electrode and workpiece melts the workpiece and produces a gouge as the torch traverses over ` the workpiece at a predetermined rate of speed. A high ~elocity air jet or jets blow the molten material away as the gouge is produced.
Automatic arc gouging torches of the prior art-are capable of producing high quality gouges with accept-able characteristics in terms of gouge depth and width.
However, these prior art torches have been plagued by certain problems~ One problem that has been encountered is that of excessive nozzle usage. The torch nozzle at the front end assembly is used to direct high velocity air at the workpiece to blow away the molten material.
` The nozzle is also used to make electrical contact with the carbon electrode as it is being fed through the torch.
The nozzle usually employs a spring element for this pur-pose which is placed in the nozzle boré to load the carbon , .
.. . ... . . .
, 11,337 3~7~71~
electrode against the oppOsiee side of the bore and thereby maintain continuous electrical contact with the electrode If, for any reason, the external forces acting on the tip of the carbon electrode exceed the ; spring force, the electrode may break away from intimate contact with the nozzle bore and arcing may occur between the nozzle and the electrode. Since the arc current in these torches is quite high, e.g., 600 to 1500 amperes depending on electrode size, any interruption in electrode contact usually results in immediate damage to the nozzle.
This damage after one or perhaps several such occurrences may be extensive enough to require the operator to re-place the nozzle. Since the resultant down time and interruption of the gouging operation is costly and the price of the nozzle itself is high, it will be evident that nozzle damage is considered to be a major problem.
; Another problem that has been encountered with the prior art torches is the complexity of changing torch parts in order to accommodate a~c gouging electrodes of different size. Conventionally, the carbon electrode is fed through the torch between a motor drive roll and a pressure roll. A spri~g adjustment is necessary for each size electrode to load the electrode against the drive roll. This is a difficult adjus~ment which requires an experienced operator.
. .
11,337 SUMMARY QF THE I~VENT~ON
The present invention is directed to an improved automatic arc gouging torch having a pivotable front end assembly for dynamically urging the nozzle ~nto contact against the carbon electrode so as to assure continuous electrical contact during operation. In general, the arc gouging torch includes a hollow torch body, means for continuously feeding the arc gouging electrode through the torch body and a front end assembly for guiding the `~ 10 electrode and maintaining the nozzle in ele~trical contact with the electrode. The front end assembly includes a hollow nozzle body which extends outwardly fr~m the front end of the torch body and which holds the nozzle in place at the outer end thereof. The hollow nozzle body forms a plenum chamber about the electrode which fills with air fed under pressure to the torch. The pressuri~ed air passes through the nozzle to blow away the molten material that collects on the workpiece during the goug-ing operation. The nozzle body in the front end assembly is pivotally ~ecured to the toreh body at a location spaced fro~ the longitudinal ax~s of the torch to pro- -- ~ide a fulcrum for rotating the nozzle body into con~act against the gouging electrode by means ~f a turning moment established by the gas pressure in the plenum - chamber.
. 11,337 ~l5~77~
BRIEF DESCRIPTION OF THE DRA~INGS
Figure 1 is a schematic view of an automatic arc gouging torch in accordance with the present inven-tion;
Figure 2 is an e~evàtional sectional view of ;:
the arc gouging torch shown in Figure l;
Figure 3 is a sectional ~iew of the torch '; taken along the lines 3-3 in Figure 2; and Figure 4 is an elevational sectional view of - 10 the torch shown in Figure 1 rotated to a different posi-tion to show the cable feed through the torch for supply-ing electrical power and air.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now to the drawings and more partic-ularly to Figure 1, there is shown an automatic arc gouging torch T having a hollc~w torch body 10, a guide tube 12 extending longitudina~ly from the rear end of . .
the torch ~ody 10, and a fron1: end assembly 14 extending longitudinally from the front end o~ the torch body 10.
~: 20 As shown, the torch T is mounted onto an elongated hori-`~ ~ontal ~rame F which carries an automatically controlled motor drive mechanism (not shown) for moving the torch T
relative to the workpiece W at a predetermined rate of speed in ~he direction shown. The arc gouging process is begun by:feeding an elongated carbon electrode E
through the torch T at a predetermined angle relative to the workpiece W until contact is made with the work-piece W; striking an arc A between the electrode E and ll,337 ~ 7~
workpiece W and then automatically controlling the elec-trode feed rate to maintain a constant distance between the tip of ~he e~ectrode F and the workpiece W, while the electrode is consumed. When the arc A is established~
the torch T autvmatically moves at a predetermined control rate of speed across the workpiece ~ to form a gouge G..
At the same ~ime, the molten material formed during the goug-ing operation is blown ahead of the electrode E by a high velocity stream of air l6 delivered through the nozzle N
about the moving electrode E. The supply of air 16 is fed from any conventional source of supply through cable C into the torch T through the front end assembly 14 from whence it discharges through the nozzle N.
Referring to Fig. 2, the torch body lO encloses a chamber l9 having a front end opening 20 and a rear end open-ing 21 spaced apart along a substantially common central axis for passage of an electrode E. A spring loaded pressure roll assembly 22 extends lnto the chamber l9 for urging the electrode E against a drive roll assembly 24. The spring loaded pressure roll assembly 22 is connected to the torch body lO by means of a mounting bracket 23 and comprises a pressure roll 26 connected to a piston assembly 28, a compres-sion spring 30 surrounding the piston assembly 28 and a cam linkage 32 coupling the piston assembly 28 to a manually operable handle 34 located external of the torch body lO.
The drive roll assembly 24 comprises a drive roll 27 coupled to the shaft 29 of a drive motor M (Fig. 3). The pressure ~ roll 26 and drive roll 27 are aligned in a substantially -. common place lying substantially normal to the direction of electrode feed.
.
11,337 7 ~
~he piston assembly 28 retracts upon rotating the handle 34 clockwise to a position 180 from that shown to provide a predetermined spacing between pressure roll 26 and the drive roll 27 to accommodate `
electrodes E of varying diameters over a relatively wide range. With the handle 34 rotated counter-clockwise to the original position, the piston assembly 28 is lowered permitting the spring 30 to apply a predetermined loading on the electrode E between the pressure roll 26 and the drive roll 27.
A cylindrical guide 36 and sleeve 37 ex-tends from the front end opening 20 of the torch body 10 in threaded engagement with an insulating block 38 connected to the torch body by bolts 39.
The sleeve 37 has a central bore 35 sized to the diameter of the electrode E. The front end assembly 14 comprises a cylindrical nozzle body 40 and an insulating sleeve 42. The nozzle body 40 surrounds the guide 36 and sleeve 37 in a substantially con-centric relationship leaving an open space there-between which forms a plenum chamber 44. A nozzle N preferably of copper is detachably secured through a bolt 47 to the front end of the nozzle body 40.
The nozzle N has a central bore 45 and a plurality of annular drilled openings 49. The bore 45 is sized to the diameter of the electrode E.
The nozzle body 40 has a flanged end 46 which abuts an annular sealing member 48 seated upon the lip 50 of a support cover 52. The support cover 52 is an extension of the torch body 10 3nd is connected ~ `
to the insulating block 38 through bolts 58. The seal-ing member 48 may represent any conventional compression seal of resilient material such as rubber and in any geometry, e.g., a squ3re "0" ring. A potting compound such as silicone may also be used.
~5~778 The nozzle body 40 is hingeably secured to the support cover 52 ~y means of a pivot pin 54. The pivot pin 54 is positioned above the central ax~s of the torch T and acts as a fulcrum permitting rotation of the front end assembly 14 in response to air pressure in the plenum chamber 44 as will ~e.h~rea~te.~ expla~ined in:moreidetail.
It should be apparent that without the presence of the electrode E the front end assembly 14 is freely adjust-able about the pivot pin 54 within the limited degree of freedom provided by the space 56 between the front end assembly 14 and the lip 50 of support cover 52.
An electrode E is loaded into the torch by rotating the handle 34 and inserting the electrode through the guide tube 12, passing it between the pressure roll 26 and drive roll 27 respectlvely and then through the sleeve 37. The front end assemblly is adjusted to align the bore 45 of the nozzle N so that its central axis is common with the central axis of the sleeve bore 35. The electrode E is then passed through the bore 45 of the nozzle N and the handle 34 is repositioned.
Electrical power is supplied to the torch T
simultaneously with a supply of air through a concentric cable C which enters through the back of the torch body 10 as reviewed from Figure 1 and passes through the cham-~ ber 19 as shown in Figures 3 and 4 into the front end assembly 14. The cable has an inner copper stranded wire conductor 60 which terminates in the flanged end 46 o~
, the nozzle body 40 and an outer conduit 62 which termin-,` ates in the open area 64 which in turn communicates with . 8 11,337 ~ 7~ 8 the plenum chamber 44. Air passes through the passageway ~6 between the inner conductor 60 and the outer conduit 62 of the cable C, into the open area 64 from whence it fills the plenum chamber 44 discharging through the openings 49 in the nozzle N. The pressure drop across the openings 49 develops the pressure in the plenum chamber 44. Typically the plenum pressure is 10-20 psig. Since the pivot pin 54 is off-center, the normal force of the air pressure in the plenum tries to pivot the front end assembly 14 counterclockwise.
.
BACKGROUND OF THE INVENTION
The present invention relates to automatic arc gouging machines and more particu7arly to an automatic arc gouging torch.
The automatic arc gouging process is carried out by feeding an elongated carbon electrode through an arc gouging torch into contact with the workpiece, striking an arc, and then while the electrode is being consumed, automatically controlling the electrode feed ` 10 rate in order to maintain a constant distance between the tip of the electrode and the workpiece. The arc thus established between the electrode and workpiece melts the workpiece and produces a gouge as the torch traverses over ` the workpiece at a predetermined rate of speed. A high ~elocity air jet or jets blow the molten material away as the gouge is produced.
Automatic arc gouging torches of the prior art-are capable of producing high quality gouges with accept-able characteristics in terms of gouge depth and width.
However, these prior art torches have been plagued by certain problems~ One problem that has been encountered is that of excessive nozzle usage. The torch nozzle at the front end assembly is used to direct high velocity air at the workpiece to blow away the molten material.
` The nozzle is also used to make electrical contact with the carbon electrode as it is being fed through the torch.
The nozzle usually employs a spring element for this pur-pose which is placed in the nozzle boré to load the carbon , .
.. . ... . . .
, 11,337 3~7~71~
electrode against the oppOsiee side of the bore and thereby maintain continuous electrical contact with the electrode If, for any reason, the external forces acting on the tip of the carbon electrode exceed the ; spring force, the electrode may break away from intimate contact with the nozzle bore and arcing may occur between the nozzle and the electrode. Since the arc current in these torches is quite high, e.g., 600 to 1500 amperes depending on electrode size, any interruption in electrode contact usually results in immediate damage to the nozzle.
This damage after one or perhaps several such occurrences may be extensive enough to require the operator to re-place the nozzle. Since the resultant down time and interruption of the gouging operation is costly and the price of the nozzle itself is high, it will be evident that nozzle damage is considered to be a major problem.
; Another problem that has been encountered with the prior art torches is the complexity of changing torch parts in order to accommodate a~c gouging electrodes of different size. Conventionally, the carbon electrode is fed through the torch between a motor drive roll and a pressure roll. A spri~g adjustment is necessary for each size electrode to load the electrode against the drive roll. This is a difficult adjus~ment which requires an experienced operator.
. .
11,337 SUMMARY QF THE I~VENT~ON
The present invention is directed to an improved automatic arc gouging torch having a pivotable front end assembly for dynamically urging the nozzle ~nto contact against the carbon electrode so as to assure continuous electrical contact during operation. In general, the arc gouging torch includes a hollow torch body, means for continuously feeding the arc gouging electrode through the torch body and a front end assembly for guiding the `~ 10 electrode and maintaining the nozzle in ele~trical contact with the electrode. The front end assembly includes a hollow nozzle body which extends outwardly fr~m the front end of the torch body and which holds the nozzle in place at the outer end thereof. The hollow nozzle body forms a plenum chamber about the electrode which fills with air fed under pressure to the torch. The pressuri~ed air passes through the nozzle to blow away the molten material that collects on the workpiece during the goug-ing operation. The nozzle body in the front end assembly is pivotally ~ecured to the toreh body at a location spaced fro~ the longitudinal ax~s of the torch to pro- -- ~ide a fulcrum for rotating the nozzle body into con~act against the gouging electrode by means ~f a turning moment established by the gas pressure in the plenum - chamber.
. 11,337 ~l5~77~
BRIEF DESCRIPTION OF THE DRA~INGS
Figure 1 is a schematic view of an automatic arc gouging torch in accordance with the present inven-tion;
Figure 2 is an e~evàtional sectional view of ;:
the arc gouging torch shown in Figure l;
Figure 3 is a sectional ~iew of the torch '; taken along the lines 3-3 in Figure 2; and Figure 4 is an elevational sectional view of - 10 the torch shown in Figure 1 rotated to a different posi-tion to show the cable feed through the torch for supply-ing electrical power and air.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now to the drawings and more partic-ularly to Figure 1, there is shown an automatic arc gouging torch T having a hollc~w torch body 10, a guide tube 12 extending longitudina~ly from the rear end of . .
the torch ~ody 10, and a fron1: end assembly 14 extending longitudinally from the front end o~ the torch body 10.
~: 20 As shown, the torch T is mounted onto an elongated hori-`~ ~ontal ~rame F which carries an automatically controlled motor drive mechanism (not shown) for moving the torch T
relative to the workpiece W at a predetermined rate of speed in ~he direction shown. The arc gouging process is begun by:feeding an elongated carbon electrode E
through the torch T at a predetermined angle relative to the workpiece W until contact is made with the work-piece W; striking an arc A between the electrode E and ll,337 ~ 7~
workpiece W and then automatically controlling the elec-trode feed rate to maintain a constant distance between the tip of ~he e~ectrode F and the workpiece W, while the electrode is consumed. When the arc A is established~
the torch T autvmatically moves at a predetermined control rate of speed across the workpiece ~ to form a gouge G..
At the same ~ime, the molten material formed during the goug-ing operation is blown ahead of the electrode E by a high velocity stream of air l6 delivered through the nozzle N
about the moving electrode E. The supply of air 16 is fed from any conventional source of supply through cable C into the torch T through the front end assembly 14 from whence it discharges through the nozzle N.
Referring to Fig. 2, the torch body lO encloses a chamber l9 having a front end opening 20 and a rear end open-ing 21 spaced apart along a substantially common central axis for passage of an electrode E. A spring loaded pressure roll assembly 22 extends lnto the chamber l9 for urging the electrode E against a drive roll assembly 24. The spring loaded pressure roll assembly 22 is connected to the torch body lO by means of a mounting bracket 23 and comprises a pressure roll 26 connected to a piston assembly 28, a compres-sion spring 30 surrounding the piston assembly 28 and a cam linkage 32 coupling the piston assembly 28 to a manually operable handle 34 located external of the torch body lO.
The drive roll assembly 24 comprises a drive roll 27 coupled to the shaft 29 of a drive motor M (Fig. 3). The pressure ~ roll 26 and drive roll 27 are aligned in a substantially -. common place lying substantially normal to the direction of electrode feed.
.
11,337 7 ~
~he piston assembly 28 retracts upon rotating the handle 34 clockwise to a position 180 from that shown to provide a predetermined spacing between pressure roll 26 and the drive roll 27 to accommodate `
electrodes E of varying diameters over a relatively wide range. With the handle 34 rotated counter-clockwise to the original position, the piston assembly 28 is lowered permitting the spring 30 to apply a predetermined loading on the electrode E between the pressure roll 26 and the drive roll 27.
A cylindrical guide 36 and sleeve 37 ex-tends from the front end opening 20 of the torch body 10 in threaded engagement with an insulating block 38 connected to the torch body by bolts 39.
The sleeve 37 has a central bore 35 sized to the diameter of the electrode E. The front end assembly 14 comprises a cylindrical nozzle body 40 and an insulating sleeve 42. The nozzle body 40 surrounds the guide 36 and sleeve 37 in a substantially con-centric relationship leaving an open space there-between which forms a plenum chamber 44. A nozzle N preferably of copper is detachably secured through a bolt 47 to the front end of the nozzle body 40.
The nozzle N has a central bore 45 and a plurality of annular drilled openings 49. The bore 45 is sized to the diameter of the electrode E.
The nozzle body 40 has a flanged end 46 which abuts an annular sealing member 48 seated upon the lip 50 of a support cover 52. The support cover 52 is an extension of the torch body 10 3nd is connected ~ `
to the insulating block 38 through bolts 58. The seal-ing member 48 may represent any conventional compression seal of resilient material such as rubber and in any geometry, e.g., a squ3re "0" ring. A potting compound such as silicone may also be used.
~5~778 The nozzle body 40 is hingeably secured to the support cover 52 ~y means of a pivot pin 54. The pivot pin 54 is positioned above the central ax~s of the torch T and acts as a fulcrum permitting rotation of the front end assembly 14 in response to air pressure in the plenum chamber 44 as will ~e.h~rea~te.~ expla~ined in:moreidetail.
It should be apparent that without the presence of the electrode E the front end assembly 14 is freely adjust-able about the pivot pin 54 within the limited degree of freedom provided by the space 56 between the front end assembly 14 and the lip 50 of support cover 52.
An electrode E is loaded into the torch by rotating the handle 34 and inserting the electrode through the guide tube 12, passing it between the pressure roll 26 and drive roll 27 respectlvely and then through the sleeve 37. The front end assemblly is adjusted to align the bore 45 of the nozzle N so that its central axis is common with the central axis of the sleeve bore 35. The electrode E is then passed through the bore 45 of the nozzle N and the handle 34 is repositioned.
Electrical power is supplied to the torch T
simultaneously with a supply of air through a concentric cable C which enters through the back of the torch body 10 as reviewed from Figure 1 and passes through the cham-~ ber 19 as shown in Figures 3 and 4 into the front end assembly 14. The cable has an inner copper stranded wire conductor 60 which terminates in the flanged end 46 o~
, the nozzle body 40 and an outer conduit 62 which termin-,` ates in the open area 64 which in turn communicates with . 8 11,337 ~ 7~ 8 the plenum chamber 44. Air passes through the passageway ~6 between the inner conductor 60 and the outer conduit 62 of the cable C, into the open area 64 from whence it fills the plenum chamber 44 discharging through the openings 49 in the nozzle N. The pressure drop across the openings 49 develops the pressure in the plenum chamber 44. Typically the plenum pressure is 10-20 psig. Since the pivot pin 54 is off-center, the normal force of the air pressure in the plenum tries to pivot the front end assembly 14 counterclockwise.
.
Claims (9)
1. An arc gouging torch comprising:
a hollow torch body enclosing a chamber having open ends spaced apart along a substantially common axis;
a guide tube extending longitudinally from one of the open ends of said chamber;
guide means extending longitudinally from the opposite open end of said chamber;
means for driving an electrode through each open end of said torch body;
a front end assembly including a nozzle body surrounding said guide means for forming a plenum chamber therebetween;
means for pivotally connecting said nozzle body to said torch body;
means for passing air from a source external of said torch through said torch body and into said plenum chamber; and a nozzle coupled to said nozzle body, said nozzle having a bore through which the electrode is passed and at least one opening for discharging air from said pelnum chamber whereby air pressure in said plenum chamber urges said nozzle body against the electrode to maintain electrical contact therewith throughout the gouging operation.
11,337
a hollow torch body enclosing a chamber having open ends spaced apart along a substantially common axis;
a guide tube extending longitudinally from one of the open ends of said chamber;
guide means extending longitudinally from the opposite open end of said chamber;
means for driving an electrode through each open end of said torch body;
a front end assembly including a nozzle body surrounding said guide means for forming a plenum chamber therebetween;
means for pivotally connecting said nozzle body to said torch body;
means for passing air from a source external of said torch through said torch body and into said plenum chamber; and a nozzle coupled to said nozzle body, said nozzle having a bore through which the electrode is passed and at least one opening for discharging air from said pelnum chamber whereby air pressure in said plenum chamber urges said nozzle body against the electrode to maintain electrical contact therewith throughout the gouging operation.
11,337
2. An arc gouging torch as defined in claim 1 wherein said means for pivotally connecting said nozzle body to said torch body comprises a hinge pin spaced from the central axis of the torch to provide a turning moment in response to air pressure in said plenum chamber.
3. An arc gouging torch as defined in claim 2 wherein said nozzle body has a flanged end through which said hinge pin is connected to said torch body.
4. An arc gouging torch as defined in claim 2 further comprising a support cover extending from said torch body and resilient means separating said flanged end from said support cover.
5. An arc gouging torch as defined in claim 2 wherein said means for driving the electrode comprises a drive motor assembly including a drive roll disposed within said chamber.
6. An arc gouging torch as defined in claim 5 further comprising means for urging said electrode against said drive roll.
7. An arc gouging torch as defined in claim 6 wherein said means for urging said electrode comprises a pressure roll, manually operated means for adjusting said pressure roll into a first position spaced from said drive roll to accommodate an electrode of any size diameter within a predetermiend size range and into a second position with said pressure roll abutting said electrode, and spring means for loading said electrode against said drive roll in said second position.
11,337
11,337
8. An arc gouging torch as defined in claim 7 wherein said manually operated means is a handle located external of said torch body, a piston assembly and means for linking said piston assembly to said handle.
9. An arc gouging torch as defined in claim 8 wherein said spring means comprises a compression spring surrounding said piston assembly.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US3591279A | 1979-05-04 | 1979-05-04 | |
| US035,912 | 1979-05-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1150778A true CA1150778A (en) | 1983-07-26 |
Family
ID=21885512
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000341365A Expired CA1150778A (en) | 1979-05-04 | 1979-12-06 | Arc gouging torch with carbon electrode and air pressure biased nozzle body |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1150778A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10239163B2 (en) | 2009-12-17 | 2019-03-26 | Saipem S.P.A. | Pipeline weld repairing method and apparatus |
-
1979
- 1979-12-06 CA CA000341365A patent/CA1150778A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10239163B2 (en) | 2009-12-17 | 2019-03-26 | Saipem S.P.A. | Pipeline weld repairing method and apparatus |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6423936B1 (en) | Welding apparatus | |
| US4590358A (en) | Apparatus for electrically isolated hot wire surfacing processes | |
| US3632952A (en) | Electric arc metal spray gun | |
| EP0444346A2 (en) | Plasma arc torch having extended nozzle | |
| US4088866A (en) | Method and an apparatus for automatic electric welding | |
| CA2061022C (en) | Plasma arc torch | |
| US3007032A (en) | Universal arc welding torch | |
| US3818175A (en) | Welding torch | |
| US4482797A (en) | Electrode biasing welding torch | |
| US5097108A (en) | Conversion convergent nozzle assembly | |
| EP0124006A1 (en) | Electrode drive and nozzle system for an automatic air carbon-arc cutting and gouging torch | |
| US2981825A (en) | Contact tip for welding gun | |
| US4916270A (en) | Mig welder cutting head attachment | |
| CA1150778A (en) | Arc gouging torch with carbon electrode and air pressure biased nozzle body | |
| CA1067584A (en) | Method and torch for sustaining multiple coaxial arcs | |
| US2778099A (en) | Method of welding and apparatus therefor | |
| US4260867A (en) | Electrode drive and nozzle system for automatic air-carbon arc cutting and gouging torch | |
| JPH02502357A (en) | Current nozzle for mig and mag welding burners | |
| CN1043460C (en) | Arc torch or arc cutting torch and pole clamper of same | |
| JP2879551B2 (en) | Electrode mounting structure in TIG welding machine | |
| CA1217240A (en) | Metal treating method and apparatus | |
| GB1312302A (en) | Gas shielded arc welding torches | |
| US2903554A (en) | Cutting and gouging torch | |
| SU1397218A1 (en) | Apparatus for automatic submerged overhead welding | |
| US3213261A (en) | Two length gap fusion spot welding method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |