What is open circuit voltage for arc welding?

Explanation: The selection of an optimum value of OCV (Open circuit voltage) depends on the type of base metal, a composition of electrode coating, type of welding current and polarity, type of welding process etc. It generally varies from 50 V – 100 V.

What is maximum OCV?

The open-circuit voltage is usually between 50 and 80 V. The higher the open-circuit voltage, the easier it is to strike an arc because of the initial higher voltage pressure.

What is the difference between open circuit voltage and arc voltage?

OCV is generally found to be different from arc voltage. Arc voltage is potential difference between the electrode tip and work piece surface when there is flow of current. Any fluctuation in arc length affects the resistance to flow of current through the plasma and hence arc voltage is also affected.

What is the OCV of welding in step down transformer which reduces the main supply voltage?

1. Welding Machine: The welding machine used can be A.C. or D.C. welding machine. The A.C. welding machine has a step-down transformer to reduce the input voltage of 220- 440V to 80-100V.

What is rol in welding?

* In case of WPS with CVN impact test and no PWHT requirement: As common sense dictates, the Welding inspector will take a look on Weld bead profile firstly. The increase of Weld bead (Width) or reduction of R.O.L (Run out length) which makes toughness deduction.

Why is the OCV voltage capped at a certain level?

d. The voltmeter may be connected only across the circuit (to the workpiece and as close as possible to the electrode!)…4) Why is the OCV capped at this voltage setting?

a.	To save electricity
c.	Allow smooth transition into welding voltage range
d. ( answer )	To reduce the risk of fatality

Why is the OCV capped at this voltage setting?

What do you call a weld line?

In manufacturing, the Weld line or Knit line or Meld line is the line where two flow fronts meet when there is the inability of two or more flow fronts to “knit” together, or “weld”, during the molding process. These lines usually occur around holes or obstructions and cause locally weak areas in the molded part.