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MWG-170 Open TIG Pipe Welding Equipment

A. MWG-170 Complete Set of Equipment

1. All-position open TIG pipe welding tongs，model：MWG-170；
2. Integrated Control Power Supply, model：MWA-400；
3. External wire feeder，model：MWS-170。

B. MWG-170 pipe welding tongs function

1. The equipment adopts modular design, the main components are aluminum structure, exquisite design, compact structure；
2. Stepless adjustable caliper clamp，Meet the requirements of pipe diameter clamping within the coverage of equipment；
3. Structure Design of Gapless Gear Transmission；
4. Features automatic arc length and swing control；
5. Suitable for carbon steel, stainless steel and other materials of pipeline welding, equipped with external wire feeding mechanism。

C. Technical parameters and appearance size

1. Welding pipe diameter：Φ63mm-Φ168mm；
2. tungsten electrode diameter：Φ2.4mm；
3. Rotation speed of welding gear ring：0.2rpm-6rpm；
4. Protective gas : argon
5. Cooling method : water circulating cooling；
6. Cooling water flow : 1000 ml / min；
7. Applicable wall thickness：2mm-10mm；
8. Welding tongs weight : 9.8KG ( without cable )；
9. Overall dimension of equipment：

D. Welding process requirements

1. Draw a circle around the center of the welded pipe fitting, and there shall be no obstacles within the range of R = 210mm；
2. When welding the pipe mouth, the length of the straight segment can be clamped

≥190mm；

1. Groove Shapes ：
2. When the wall thickness of the pipe fittings is ≤ 2.5mm, the welding form of seamless docking of the flat mouth is adopted；
   1. Rust removal, deburring, water removal, oil removal, and dirt removal are required for the inner and outer walls of the welded pipe opening extending inward 20mm；
   2. The welded pipe mouth must be treated by flat mouth treatment；
3. The perpendicularity of welded tube mouth and tube body shall be strictly controlled, verticality error ≤±0.5°；
4. Spot welding is required for pipe butt welding，the smaller solder joints, the better，conversely will affect the welding forming effect and welding quality；
5. The error of staggered side in welding pipe butt ≤5% of pipe wall thickness；
6. Welded pipe mouth adopts seamless joint，Maximum gap ≤ 5% of pipe wall thickness；
7. Pipe wall thickness 2.6mm-6mm need to open groove welding, and the groove form is V-shaped；
   1. Rust removal, deburring, water removal, oil removal, and dirt removal are required for the inner and outer walls of the welded pipe opening extending inward 20mm；
   2. The angle of the unilateral groove ≥ 37°-55°（Different materials with different groove Angle, according to the process requirements and on-site training personnel requirements for groove Angle processing）；
   3. No blunt edges are allowed to be left at the welding pipe opening during groove machining. All blunt edges are finished, and no wavy groove is allowed；
   4. The perpendicularity of welded tube mouth and tube body shall be strictly controlled, verticality error ≤±0.5°；
   5. Spot welding is required for pipe butt welding，the smaller solder joints, the better，conversely will affect the welding forming effect and welding quality；
   6. The error of staggered side in welding pipe butt ≤5% of pipe wall thickness；
8. Welded pipe mouth adopts seamless joint，Maximum gap ≤ 5% of pipe wall thickness；
9. Pipe wall thickness > 6 and ≤ 10 need to open groove welding, and the groove form is U-shaped；
   1. Rust removal, deburring, water removal, oil removal, and dirt removal are required for the inner and outer walls of the welded pipe opening extending inward 20mm；；
   2. Unilateral groove width ≥ 3mm, groove Angle ≤ 30 ° , and maximum opening position ≤8mm；
   3. A blunt edge ≤1.2mm shall be reserved for the welding pipe mouth when groove making, and the thickness error of the blunt edge shall be ≤10%；
10. The perpendicularity of welded tube mouth and tube body shall be strictly controlled, verticality error ≤±0.5；
11. Spot welding is required for pipe butt welding，the smaller solder joints, the better，conversely will affect the welding forming effect and welding quality；
12. The error of staggered side in welding pipe butt ≤10% of the blunt edge thickness；
13. Welded pipe mouth adopts seamless joint，Maximum gap ≤ 5% of pipe wall thickness；
14. When welding, the welded pipe fittings must be firmly grounded；
15. When welding, pure argon is not less than 99.99 %. If the welded pipe is stainless steel, titanium alloy and other easily oxidized materials need internal argon filling protection.；

According to the different pipe fittings of each customer, our company will provide a detailed and clear plan for the specific groove form and parameters，the specific situation is subject to the requirements of on-site after-sales personnel。

E. Equipment welding method

1. The equipment is a full position TIG welding method, that is, the welding torch is fixed on the pipe, and the welding forceps rotate along the pipe for a week, including flat welding, uphill welding, downhill welding and uphill welding. Due to the different stress of the molten pool in different positions, the heat input is also different. It is necessary to set different process parameters such as peak current, base current and arc voltage, which can be set on the man-machine interface of MWA-400 integrated control power supply.；
2. Single - side welding double - side forming，Stainless steel pipe fittings shall be filled with protective gases ( argon or other protective gases )，Argon flow rate is 0.5-8L / min, argon protection flow rate is 8-15L / min.；
3. The equipment can be wire-added or self-melted, customers can be selected according to          the process requirements of pipe fittings, wire-added welding, tungsten electrode and weld center height maintained at 2mm-4mm。

MWA-400 Integrated welded Control Power Supply

1. Equipment performance characteristics

1. Integrated control of the appearance and structure of power supply,professional design, rational atmosphere, simple, patent design products；
2. Reasonable internal structure design, easy to move, install and operate on site；

1. Intelligent PLC control system to ensure accurate and rapid operation of welding process parameters；
2. Color 10-inch touch screen, graphic and step interface design, simple and fast operation；
3. Real-time monitoring of welding current, voltage, rotation speed, swing speed and other parameters, and according to customer requirements can be configured to print the current welding parameters at any time for reference and comparison；
4. Perfect function of interval segmentation and parameter preservation, changing, fetching and preserving according to different welding process requirements；
5. Cooling water circulation，equipment temporary load rate is high；
6. The hand control device has complete functions and is more convenient to use；
7. The welding simulation function can be realized, and the problems in the application of current parameters to actual welding can be found in time；
8. With tungsten pole short circuit protection, motor overload protection, current detection, flow detection and fault prompt function。

B.Equipment technical parameters

1. Technical parameters of welding power supply

• Welding machine mode：POWER DC-402；
• Input power ：4-400A；
• Control mode：IGBT inverter；
• Input voltage range：AC380V±10%（three-phase）；
• Rated input power：13.2KW；
• power frequency：50/60 Hz；
• load sustaining rate：60%；
• insulation grade：H；
• protection grade：IP 23。

1. Technical parameters for control systems
2. Control function

• DC or pulse current control；
• Constant control of automatic rotation of welding tongs；
• Automatic control of wire feeding speed and movement；
• Speed feedback control of welding tongs Rotation；
• he required parameters can be set in 12 intervals；
• 80 sets of process parameter codes can be saved；
• Automatic arc length and yaw control。

1. Protection function

• Motor overload protection；
• Current detection；
• Arc failure protection；
• Phase-deficient protection of arc length and yaw；
• Tungsten pole short circuit protection；
• Fuse protection function to protect equipment；
• All kinds of abnormal information display。

1. Overall dimension and weight of integrated control power supply

• dimensions L×W×H：770×470×890mm/30.3×18.5×35inch；
• Weight：120KG/264ib。

MWS-170 External wire feeder

A Equipment technical parameters

1. Adopt double wheel drive, can make wire feeding more smooth, smooth；
2. Knob to adjust the tension device, according to different wire diameter to adjust the tightness；
3. Simple structure design and easy operation；
4. The length of the wire feeding pipe is 3m。

Major configuration of complete equipment

Particular attention

Before the equipment is officially used, the professional electrician on the demand side will connect the power supply of the equipment, the power line is a three-phase four-core wire, of which the yellow-green wire is the grounding wire, and the other three are 380V, which must be firmly grounded according to the national standard, otherwise the use of equipment is strictly prohibited.