Quantitive Quality Indicators (QQI™) 

Use to verify your MPI procedures 

Quantitive Quality Indicators (QQIs) are artificially-flawed, low-carbon steel specimens that you can use in magnetic particle inspection to verify your MPI procedures. They provide a quantitative method of establishing the correct field direction and strength that are needed to produce clear indications of flaws.

Benefits/Features 

• Improved inspection reliability.
• Increased productivity through reducing the number of magnetising ‘shots’ that are needed.
• Increased productivity through reducing the number of magnetising ‘shots’ that are needed.
• A simple procedure set-up, particularly for multi-directional applications.
• Quantitative assessment: results can be compared with other parameters, such as Hall Effect Gaussmeter readings, to facilitate better process control.
• Assured field balance for multi-directional MPI.
• Effective assessment on any part, regardless of its shape.
• Reusable if carefully applied and removed. Alternatively, they can be permanently mounted.
• Helps prevent over-magnetisation.

Ordering Information 

Std QQI Model KSC-230/CX-230: 625551 0.002” shim thickness, 30% notch depth

Std QQI Model KSC-430/CX-430: 625553 0.004” shim thickness, 30% notch depth

Its circular and crossed bar flaw configuration is suitable for longitudinal and circular fields. The circular flaw is especially useful in balancing multi-directional fields.

Std QQI Model KSC4-230/CX4-230: 625552 0.002” shim thickness, 30% notch depth

A miniature QQI shim, like four KSC-230s in one, designed for small areas on a test part. It has four circular flaws with a cross in the centre.

Variable Depth QQI Model KSCT-234/3C2-234: 625554 0.002” shim thickness, 20% / 30% / 40% notch depth

For more quantitative work, this QQI shim has three evenly spaced concentric circular flaws of varying depth.

Our QQIs are sold in sets of 5.

Product Properties 

NDT Type: Fluorescent Magnetic Particle Testing, Visible Magnetic Particle Testing

Applications 

First, make sure that the test surface and the QQI shim are clean and dry. Place the QQI shim flaw-side-down onto the test surface and secure it in place. The KSC-230 and KCST-234 shims are self-adhesive; KSC-4-230 can be secured with a cyano-acrylate superglue or clear pressure-sensitive tape (we recommend Scotch brand 191, 471 or 600 series). Make sure there are no air gaps between the shim and the test surface. Take gaussmeter readings for both circular and horizontal fields at the point where the QQI is attached. Once you have recorded those readings, a daily meter reading will provide sufficient verification control.

Compliance 

Standards: AISI 1005, AS5371, ASTM E1444, ASTM E3024, ASME Boiler & Pressure Vessel Code, Section V, Article 7-764.1.2.