Mac Stud E73
None Applicable
Descriptions & Applications:
Extruded flux coated MMA electrode made on high alloy Duplex microstructured high tensile non-heat treatable (Hence non-softening alloyed core wire). The electrode has the ability to maintain a continuos arc when slag over slag welding while restricting the flow of the molten metal. These physical welding characteristics make the electrode ideal for the removal of threaded bolt when the bolt head has sheared at or just below the surface.
Broken bolt removal procedure:
Selecting the appropriate diameter electrode, e.g. approximately 50% of the stud's diameter. Make short continuos build up welds. During the breaks in welding remove slag and check circumference of build up is within the diameter of the stud. Repeat weld procedure until build up is 5 to 8mm above component surface. File two opposite flats on weld deposit and remove broken stud (unscrew) with the use of mole grips.
Typical All Weld Metal Chemical Analysis:
|
C
|
Si
|
Cr
|
Mn
|
Ni |
S
|
P
|
Ti
|
V
|
N²
|
| 0.04 |
1.25 |
29 |
0.99 |
12 |
0.01 |
0.01 |
0.07 |
0.15 |
0.10 |
Typical All Weld Metal Mechanical Properties: As Welded
|
Ultimate Tensile Strength
|
850 N/mm²
|
|
Elongation
|
22%
|
| Hardness Vickers |
290 HV |
| 0.2% Proof Stress |
780 N/mm² |
Current:
AC/DC (+)
Sizes Available and Recommended Amperages:
| 2.5mm |
3.2mm |
4.0mm |
5.0mm |
| 50-90 |
75-130 |
120-180 |
160-220 |
Storage:
If allowed to become damp the electrodes should be re-dried for one hour at 150°C before use.
|
|
