| "Weldtronix" Rectifier produce high quality industrial welds at significantly lower cost than Rectifier available in the market. it may be used for stick, carbon gouging and as power source to GTAW/TIG welding process. |
| Introduction to process |
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MMAW also called shield metal arc welder i.e.SMAW |
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Is a process that uses a flux covered metal electrode to carry an electrical current Fig.1-a the current forms an arc across the gap between the tip of the electrode and the work. The electric arc creates sufficient heat to melt both the electrode and the work. Molten metals from the electrode travels across the arc to the molten pool of metal are surrounded, purified and protected by gaseous cloud and a covering of slag produced as the flux coating of the electrode burns or vaporize, as the arc moves away, the mixture of the molten electrode and the base metal solidifies and becomes one piece. |
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Most common method of joining metals |
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High quality welds can be achieved rapidly and with excellent uniformity |
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A variety of metal types and metal thickness can be joined with one machine |
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DC Rectifier, Welding Transformer are used for this type of process |
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DC welding is done on two different method first is straight polarity (DCSP) Fig .1-a i.e. electrode on-ve. Polarity, second is reverse polarity (DCSP) Fig.1-c i.e. electrode on+ve polarity |
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Typical Volt- Ampere characteristics of a 'Drooping Power Source. |
Drooping or constant current type power sources Fig.1-b are convenentionally used for manual metal arc welding (MMAW) or gas tungsten arc welding (GTAW), the obvious reason being that with this type of characteristics, the welding current remains substantially constant irrespective of small variations in arc length and consequent slight change in arc voltage, which are unavoidable even in the case of a skilled welder. |
| Application |
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Construction |
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Maintenance & Repair Operation |
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Fabrication |
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Pipeline Work |
| Process Capability |
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Electrode Welding |
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TIG Welding for MS/SS/AL/CU |
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Gouging |
| Features |
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Step-less Current Control |
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Lowest Minimum Output |
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Low Input Current Consumption |
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Optional Remote Control available |
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Rough & Tough Machine Suitable for Site Work |
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Designed & engineered for easy use & maintenance |
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Very Low Maintenance Cost |
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Mobility is easy |
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X-ray Quality of welding can be achieved |
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| Shielded Metal Arc Welding Equipment (SMAW/MMAW) |
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| Straight polarity (DCSP), electrode negative (DCEN) |
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| Straight polarity (DCSP), electrode positive (DCEP) |
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| Specification |
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Static Characteristics |
Constant Current Type |
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Input Supply |
380/425/440, 3-Ø 50Hz |
380/425/440, 3-Ø 50hz |
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KVA at full load |
21(for 400 Amps) |
36(for 600 amps) |
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Current Range |
10-400 amps |
15-600 Amps |
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MAX OCV |
70-90 V DC |
70-110 V Dc |
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Duty Cycle |
60% |
60% |
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Cooling |
Forced -air cooled |
Forced-Air cooled |
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Insulation |
Class H |
Class H |
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Approx. Size (Inches) W x L x H |
20x27x27 |
23x29x30 |
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Winding |
Cu/Al |
Cu/Al |
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