Oblique Probe 4MHz 8x9mm 60° Ultrasonic Weld Flaw Detector

Oblique Probe 4MHz 8x9mm 60° | Ultrasonic Weld Inspection for Steel Structures

Achieve precise, reliable weld inspections with this professional-grade Oblique Probe (4MHz, 8x9mm, 60°). Designed for ultrasonic flaw detection on steel structures, this angled transducer probe is engineered to locate internal discontinuities, inclusions, and subsurface anomalies in welded joints — delivering accurate results in industrial, fabrication, and quality-control environments.

Key Features

• Frequency: 4MHz — optimized for high-resolution detection in steel welds
• Crystal Size: 8x9mm — compact footprint for access in tight inspection zones
• Beam Angle: 60° oblique angle ideal for weld root and fusion zone scanning
• Compatible: Works with most standard ultrasonic flaw detector units
• Steel-Optimized: Tuned specifically for use on carbon steel and structural steel weld testing
• Durable Construction: Robust casing built to withstand demanding workshop and field conditions
• Reliable Signal: High sensitivity transducer for clear, repeatable echo responses

What's in the Box?

• 1× Oblique Probe (4MHz, 8x9mm, 60°)

Typical Applications

• Steel structure weld quality inspection
• Fabrication and manufacturing QA/QC
• Pipeline and pressure vessel weld checks
• Structural engineering inspection

Made in Mainland China.

For professional guidance on non-destructive testing (NDT) standards and ultrasonic inspection procedures, refer to the OSHA Non-Destructive Testing resource.

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Frequently Asked Questions

Q: What is an oblique probe and how is it used in weld flaw detection?

A: An oblique (angled) probe emits ultrasonic waves at a set angle — in this case 60° — into the test material. This angled beam is essential for inspecting weld joints, as it allows the sound waves to travel along the weld fusion zone and reflect off any internal flaws such as cracks, porosity, or lack-of-fusion defects, which a straight-beam probe would miss. It is a standard tool in ultrasonic non-destructive testing (NDT) of steel structures.

Q: What flaw detector units is this probe compatible with?

A: This 4MHz oblique probe uses a standard connector interface compatible with most common ultrasonic flaw detector instruments. Always check the connector type of your specific flaw detector before ordering to ensure a direct fit or appropriate adapter is available.

Q: Why is a 4MHz frequency and 60° angle used for steel weld inspection?

A: A 4MHz frequency provides a good balance between penetration depth and resolution in steel, making it well-suited for detecting smaller defects in medium-thickness steel welds. The 60° refraction angle is one of the most widely used angles in weld inspection because it efficiently targets the weld root area and side-wall fusion zones — the regions most prone to critical weld defects.

Q: Is this probe suitable for use on materials other than steel?

A: This probe is optimized and calibrated for use on steel structures. While ultrasonic probes can physically contact other metals, the beam angle and frequency characteristics are specifically suited to steel's acoustic properties. For other materials (aluminum, stainless steel, etc.), verify compatibility with your flaw detector manufacturer or NDT specialist.