Nelson ALPHA 850 - Page 40

7 Start-up and weld quality check Page 35
Stud welding unit operating manual Date: July 2021
ALPHA 850 07.2021 / EN Rev.: A
• Parameters for the short cycle drawn arc process
Stud type
Shaft Ø [mm, M]
Weld
Ø [mm]
Welding current
I [A]
Welding time
t [ms]
SC stud [3.0, M3] 4 400 15
SC stud [4.0, M4] 5 500 15
SC stud [5.0, M5] 6 600 20
SC stud [6.0, M6] 7 700 25
SC stud [8.0, M8] 9 850 40
Rule of thumb for short cycle drawn arc process:
• Weld current [A] ≈ 100 × Weld Ø [mm]
• Weld time [ms] ≈ 4 × Weld Ø [mm]
• Parameters for the drawn arc process
Stud type
according to Tucker
Weld
Ø [mm]
Welding current
I [A]
Welding time
t [ms]
IS stud 3 200 150
IS stud 4 280 200
IS stud 5 350 230
KB6, MR M8, S6 6 410 250
MP (F) M8 7 470 300
MR M10,S8 8 550 300
MP (F) M10 9 650 300
KB10, MR M12, S10 10 750 350
MM12, S12 12 850 400
Rule of thumb for drawn arc process:
• Weld current [A] ≈ 70 × Weld Ø [mm]
• Weld time [ms] ≈ 40 × Weld Ø [mm]