A variety of outside diameter (OD) and inside diameter (ID) machine GTAW-P-AU equipment (Table 2-1) is commercially available from several vendors. Most of the entries in this field are track (OD) or mandrel (ID) mounted as shown in Figures 2-2 and
2-3. Additional variations include tube heads for the smaller diameter welds (Figure
2-4). This sophisticated equipment has gained an excellent reputation in recent years in
both fossil and nuclear pipe repair and replacement areas. Although some utilities own
GTAW versions of this equipment, most rely on the specialized service vendors to
provide the equipment, welding operators, and maintenance technicians during outage
situations. A move has been underway by these vendors to implement machine
GMAW and FCAW, especially in fossil water wall cladding and restoration activities.
The general unavailability of commercially available equipment has retarded imple-
mentation of machine GMAW/FCAW for piping applications (Table 2-2).
An exception to this approach exists for the small diameter tube welding apparatus. Since the cost and operational training for this equipment is relatively low and the success rate is very high, many in-house utility maintenance departments perform small bore piping and instrumentation system repairs with this equipment (Figure 2-4).
A decision to use machine or automatic welding regardless of whether it is ID, OD, or a tube head is also a decision to use precision portable machining for pipe and fitting weld end preparation. In situ welding requires implementation of precision portable machining equipment. The consistent geometries and fit-ups required to achieve suc- cess with automatic or machine techniques cannot be obtained with manual methods such as thermal cutting, gouging or grinding
|
|
|
|
GTAW Power Source and Torch
Figure 2-1b
SMAW Power Source and Electrode Holder
|
Power Source/System | Gas Tungsten Arc Welding ( GTAW ) |
Comments | ||
| Man ual | Automatic | Orb ital | ||
| Arc Machines |
| X | X |
|
| Astro-Arc/Polysoude |
| X | X | GTAW-Hot Wire Available |
| CRC-Evans |
| X | X | Not Commercially Available |
| Dimetrics |
| X | X | Gold Track II w/F-Head. DSP Power Source, MGD Head. |
| Diahen/OTC [Fuzzy Logic ] |
| X | X | Robotic Applications |
| ESAB (Airco/L-Tech) | X | X | X 1 | 1Offered in the past |
| Fronius | X | X |
| Hot & Cold Wire |
| Hobart [Arc Master 501] | X | X | X 1 | 1ID and Tube Head Only |
| Kemppi [PPI 5000 ] | X | X |
|
|
| Lincoln [Pulse Power 500 ] [Power Wave 450] [Square Wave 355 ] | X | X |
|
|
| Magnatech Pipeliner | X | X | X | Fronius Power Source |
| Miller | X | X |
| Robotic Applications |
| Panasonic | X | X |
| Robotic Applications. Not Commercially Available. |
| Wachs Technical Services, Inc. | X | X | X 1 | 1Hobart Arc Master 501 Power Source with Dimetrics F-Head |
Table 2-2
Selected Gas Tungsten Arc Welding (GMAW)/Flux-Cored Arc Welding
(FCAW) Equipment
|
Power Source/System |
FCAW/GMAW |
Comments | ||
| Semi- Automatic |
Automatic |
Orb ital | ||
| Arc Machines |
|
|
| Dropped GMAW Development |
| Astro-Arc/Polysoude |
|
|
| Not Available |
| CRC-Evans |
| X | X | Not Commercially Available |
| Dimetrics |
| X | X | DSP Power Source, MGD Head |
| Diahen/OTC [Fuzzy Logic ] | X | X | X 1 | 1Robotic Applications |
| ESAB (Airco/L-Tech) | X | X 1 | X 2 | 2Offered in the past. 1Robotic. |
| Fronius | X | X | X 1 | Magnetek head |
| Hobart [Arc Master 501 ] | X | X 1 | X 2 | 1Robotic Applications. 2Dimetrics head. |
| Kemppi [PPI 5000 ] | X | X |
|
|
| Lincoln [Pulse Power 500] [Power Wave 450 ] [Invertec STT] | X | X | X 1 | 1Robotic Applications |
| Magnatech Pipeliner |
| X | X 1 | 1Fronius Power Source |
| Miller [XMT 300 CC/CV] [XMT 300 CC/TIG] [Detaweld 452] [Maxtron 450] | X | X | X 1 | 1Robotic Applications |
| PCI Energy Services Inc. | X | X | X | No t Commercially Available |
| Panasonic | X | X | X 1 | 1Robotic Applications. Not Commercially Available. |
| Wachs Technical Services, Inc. | X 1 |
| X 2 | Hobart Arc Master 501 Power Source. 1Standard Wire Feeder, 2WTS Developed Head. |
| Welding Services, Inc. | X | X | X | Not Commercially Available |
Table 4-2
Welding Power Sources Evaluated
|
| Power Source |
| Manufacturer | Lincoln |
| Model | Invertec STT |
| Process(es) | GMAW/FCAW |
| Capacity (Amperes) | Peak 0-450 Background 0-125 |
| Design Approach (Transformer-Rectifier, Inverter, etc.) | Waveform controlled inverter that monitors preset instantaneous heat requirements of the arc |
|
| Power Source |
| Manufacturer | Hobart |
| Model | Arcmaster 501 |
| Process(es) | FCAW/GMAW GTAW/SMAW |
| Capacity (Amperes) | 0-500 |
| Design Approach (Transformer-Rectifier, Inverter, etc.) | Transformer-rectifier with microprocessor control |
|
| Power Source |
| Manufacturer | Lincoln |
| Model | Power Wave 450 |
| Process(es) | FCAW/GMAW/SMAW |
| Capacity (Amperes) | 5-500 |
| Design Approach (Transformer-Rectifier, Inverter, etc.) | Digitally controlled inverter. Synergic with synergic 7 wire feeder with serial link. |
|
| Power Source |
| Manufacturer | Diahen |
| Model | Fuzzy Auto 350 EX |
| Process(es) | FCAW/GMAW |
| Capacity (Amperes) | 5-350 |
| Design Approach (Transformer-Rectifier, Inverter, etc.) | Inverter with adaptive feedback and preset conditions for selected process variations. |
Table 4-2
Welding Power Sources Evaluated (Continued)
|
| Power Source |
| Manufacturer | Fronius |
| Model | Universal Power Source 500 |
| Process(es) | GMAW/FCAW/SMAW |
| Capacity (Amperes) | Peak 3-500 Background— |
| Design Approach (Transformer-Rectifier, Inverter, etc.) | Primary transistor switched 25 MHz. |
|
| Power Source |
| Manufacturer | Panasonic |
| Model | YD-350HMYSD w/YD-351URHMYI Remote |
| Process(es) | GMAW/FCAW |
| Capacity (Amperes) | Peak 40-350 Background— |
| Design Approach (Transformer-Rectifier, Inverter, etc.) | Inverter; software controlled. |
Regards,
Yadav Shiva Chelliya,
Inspection Engineer,
Doha Qatar,
+974-6166465
Hi,
Insitu cladding by machine is very difficult Howover which type of process
and area you want to overlay This is important from method point of view.
Regards
Hegde
-----Original Message-----
From: materials-welding@googlegroups.com
[mailto:materials-welding@googlegroups.com] On Behalf Of Rakesh
Sent: Monday, April 05, 2010 11:38 PM
To: materials-welding@googlegroups.com
Subject: [MW:4661] Overlaying / cladding machine
Hi
I was looking for some information on portable Overlaying / cladding machine
for insitu job on nozzles of various dia. Can any body through some light on
make / model and avalability
Regards
Rakesh Pandey
Rakesh Pandey, Integrity Engineer,
ADMA OPCO (ADNOC group company). +971-50-1336971
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