Introduction and Applications of Gasless Flux Cored Wires E71T-11 & E71T-GS
Self shield flux cored wires (also called gasless wires ) protect the droplet and molten pool with the gas & slag produced by slag & gas making agents in the flux.
It is a popular product in more and more markets because it is very convenient without shielding gas.
1) Self shield flux core arc wires arc welding is featured with:
1. No shielding gas needed, welding torch is simpler in structure and lighter in weight, and thus the welding operation is easier
2. Better anti-wind & anti-porosity performance enables the welders weld in grade 4 wind as the welding will be protected by the gas & slag made by the flux. As long as the wind speed is not over 8m/s, no extra protection methods are requested, thus it is a very good choice for outdoor welding.
3. Deep penetration and minimum spatter
4. Good all positional welding performance including vertical down position, excellent weldability
5. Easy slag removal
2）Gasless wires welding application
1. DC current & Inverter power supply application
⒉ DC- application: weld piece to the positive electrodes and welding torch to the negative electrode. More spatters and shallow penetration can be found if wrong polarity is used
⒊ TecMig E71T-11 & E71T-GS is are good choice for your household and joy welding jobs and a good solution to welding jobs without gas cylinders and difficulties in MMA welding.
0.03’’ (0.8mm ) & 0.035’’ (0.9mm ) available with easy installation and operation. The joint is quite strong and durable according to many of my friends.
4. In vertical down position welding, please ensure 80-90 degrees angles between wires & weld piece to avoid molten metal flow down, and the sequent slag inclusion and porosity in weld bead.
5.Wire extension length should be kept 6-10 times of the wires dia.. For example, wire extension length should be 5-9mm for 0.9mm wires. If the wire extends too long, the melting of wires will be too quick, thus lead to arc stops, not-constant welding and shallow penetration
6. The surface of the weld piece should be clean and smooth, rust, oil and other impurities will lead to defective welding.
7. Keep the earth wire close to the welding zone and check if it is of good electric conductivity, if the earth wire has been oxidized, if the connecting is firm, if there is rust in the joint between earth wire and base metal. Bad conductivity will lead to not stable welding arc.
8. Welding parameters is vital for welding quality
Too low current may lead to defects like incomplete welding and slag inclusion, etc
Too high current may lead to burn-through, more spatters, molten metal & slag flow down in vertical down welding position, and porosity.
Too low voltage lead to not stable arc, narrow molten pool and slag inclusion.
Too high voltage makes the arc too far from the molten pool, air will be brought into the molten pool, thus porosity will be found.
Below are the welding parameters recommendation:
Diameter(mm) | 0.8 | 0.9 | 1.0 | |
Current/A | 80-150 | 80-150 | 80-150 | |
Voltage/V | 15-20 | 15-20 | 15-20 | |
3) Difference between E71T-11 & E71T-GS
E71T-11 is capable of multi-pass welding with better mechanical properties while E71T-GS is only capable of single pass welding. Thus E71T-11 can be used on more important welding jobs and E71T-GS is more suitable for joy welding and DIY lovers.
TecMig is good at OEM manufacturing welding wires and electrodes for international companies, pls let me know if there is anything we can do for you.
