What is Orifice Diameter in Welding?
Orifice diameter is the nozzle width through which the plasma arc passes. A smaller orifice diameter results in a narrower, more focused welding arc, while a larger orifice diameter produces a wider, less full welding arc.
What is the purpose of an orifice?
The orifice diameter plays an important role in determining the overall performance of the welding process. In general, a smaller orifice diameter will result in a more precise and accurate weld, while a larger orifice diameter will create a wider and less precise weld.
The orifice diameter is one of the main variables that can be adjusted to optimize the welding process. Other important variables include:
 torch angle,
 torch distance,
 travel speed,
 and electrode type.
How do you measure the diameter of an orifice?
There are two main ways to measure the diameter of an orifice:
 Use a ruler or caliper to measure the width of the nozzle opening.
 Use a thread gauge to measure the inside diameter of the nozzle.
What is the optimal orifice diameter for welding?
The optimal orifice diameter for welding depends on a number of factors, including:
 The type of welding being performed (e.g. TIG, MIG, plasma).
 The material being welded (e.g. steel, aluminum, copper).
 The thickness of the material being welded.
 The desired weld width.
Orifice plate flow meter
It is a device used to measure the flow rate of fluids. It consists of a thin plate with a hole in the center. The fluid flows through the hole and causes the plate to vibrate. The frequency of the vibration is proportional to the flow rate of the fluid.
Related Links
Orifice, Nozzle and Venturi Flow Rate Meters
Small Diameter Orifice Plate Flow Meter Calculation for Liquids
Orifice plate
Flowrate Calculation for an Orifice Flowmeter
Large Bore Orifice Pipe Flow Rate Meter for Liquids
Related Videos
6.2 Total pressure loss across a horizontal orifice plate
Dynamics of Fluid Flow  Orificemeter
Fluids  Lecture 3.3  Flow Rate Measurement
Orifice Plate Theory
The Differential Pressure Flow Measuring Principle (OrificeNozzleVenturi)

6.2 Total pressure loss across a horizontal orifice plate

Dynamics of Fluid Flow  Orificemeter

Fluids  Lecture 3.3  Flow Rate Measurement

Orifice Plate Theory

The Differential Pressure Flow Measuring Principle (OrificeNozzleVenturi)