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Time & Amps by Stud Diameter

When stud welding, it is important that you carefully adhere to the following guidelines, including the time and amps by stud diameter.

Stud Welding Guidelines:

  • Set appropriate time for the weld base diameter.
  • Set appropriate amperage for the weld base diameter.
  • Ensure that the negative polarity is to the stud gun.
  • Align accessories so they are centered and adjust legs so that 3/16″ to 1/4″ of the stud protrudes beyond the ferrule.
  • Ensure a good, clean ground connection.
  • Keep work surface relatively clean so that impurities don not affect weld.
  • Keep studs and ferrules clean and dry.
  • Test welds at the beginning of each shift or change in stud (AWS Bend Test).
  • Check burn off (1/8″ to 3/16″ depending on stud diameter).
  • Check weld fillet (360 degrees).
  • Visually inspect all welds.

Time & Amps by Stud Diameter

Stud Diameter Time (seconds) Current (amps)
1/4 .20 – .25 350 – 450
5/16 .25 – .30 450 – 600
3/8 .33 – .40 525 – 700
7/16 .40 – .45 675 – 750
1/2 .50 – .55 750 – 925
5/8 .65 – .70 1100 – 1400
3/4 .85 – .90 1450 – 1750
7/8(+) 1.00 – 1.20 1700 – 1950