X-ray & Gamma-ray Radiographic Inspection Applications On Titanium Alloys

Titanium alloy precision load-bearing and pressure-bearing components are prone to hidden internal defects such as pores and cracks during casting, forging and welding processes. These defects degrade material performance, shorten service life and may even trigger safety accidents. Accurate and efficient non-destructive testing (NDT) is critical to guaranteeing their quality and operational safety.

Radiographic testing stands as the mainstream method for detecting such internal defects, featuring clear imaging and archivable test results. X-rays and gamma-rays are widely adopted in industrial radiographic inspection. Although they share similar imaging principles, they differ greatly in energy level, penetration capacity, equipment configuration and applicable scenarios.

Both X-rays and gamma-rays are high-frequency electromagnetic radiation capable of penetrating solid materials. Radiographic inspection of titanium alloys relies on imaging based on differential ray attenuation: as rays pass through a workpiece, the dense substrate, pores and inclusions absorb and attenuate rays to varying degrees, resulting in differences in the intensity of transmitted radiation.

The differentiated transmitted rays form grayscale images

on radiographic films or digital detectors, enabling inspectors to identify the type, size and location of internal defects. This method delivers excellent detection performance for volumetric defects like pores, and applies to titanium alloy castings, weldments and forgings. It is also designated as a primary testing procedure under the ISO 17636-2022 standard.

1. Core Technical Characteristics

X-rays feature adjustable energy, high imaging clarity and easily controllable radiation, alongside simple operation and fast imaging speed. They offer moderate penetration power with a maximum resolution of 4–5 line pairs per millimeter, enabling identification of low-contrast microdefects such as tiny pores and inclusions in titanium alloys.

No residual radiation is generated; the equipment can be activated and shut down conveniently with favorable safety performance, making it suitable for batch workshop inspection. Its main limitation lies in insufficient penetration capacity, rendering it unsuitable for thick titanium alloy workpieces.

2. Application Scenarios

1.Thin-walled titanium alloy components: Compatible with 2–50 mm plates, thin-walled castings and finish-machined parts, widely used for aircraft skins and turbine blades to detect microporosity and shrinkage.

2.Inspection of titanium alloy welds: Clearly reveals weld defects including pores, microcracks, tungsten inclusions and incomplete penetration, applied for acceptance testing of aerospace pipelines and medical-grade titanium alloy welded assemblies.

3.Batch inspection of precision small parts: Fast and stable imaging supports high-efficiency batch screening for strict factory quality control.

3. Advantages and Disadvantages

• Advantages: High resolution, superior capability to detect microdefects, adjustable technical parameters, safe and efficient operation, stable imaging quality.
• Disadvantages: Weak penetration power, only applicable to medium and thin-walled components; high procurement and maintenance costs for equipment.

1. Core Technical Characteristics

Gamma-rays deliver constant energy and far stronger penetration than X-rays, enabling inspection of titanium alloy workpieces thicker than 50 mm. Gamma-ray equipment is lightweight and power-free, supporting operations in complex field environments such as open sites and high-altitude locations.

However, gamma-ray energy cannot be regulated, resulting in inferior imaging definition and weaker microdefect detection performance compared with X-rays. Radioactive sources continuously emit radiation, imposing stringent radiation protection requirements.

2. Application Scenarios

Inspection of heavy-section titanium alloy components: Used for forgings, ingots and nuclear pressure-bearing parts exceeding 50 mm in thickness to detect deep-seated shrinkage cavities, inclusions and cracks.

On-site field flaw detection: Eliminates the need to transport large equipment and structural weldments, allowing on-site inspection directly.

Coarse scanning of thick-walled components in batches: Large single-scan coverage ideal for general quality surveys of large workpieces.

3. Advantages and Disadvantages

Advantages: Strong penetration capacity, portable power-free equipment, adaptability to complex field conditions, low inspection costs.

Disadvantages: Low imaging precision, difficulty identifying microdefects, uncontrollable persistent radiation, rigorous safety protection and management requirements.

X-ray and gamma-ray radiographic testing each have unique applicable scenarios. Selection shall be determined based on titanium alloy workpiece thickness, structure, precision requirements and operating environment:

1.Choose X-ray testing for high-precision inspection, thin-walled small parts, precision welds, aerospace and medical components. It detects microdefects reliably and fits stable batch workshop inspection.

2.Choose gamma-ray testing for heavy-section forgings over 50 mm thick, large structures and field on-site flaw detection, leveraging its strong penetration and portable equipment.

3.For critical load-bearing components, a combined dual-process inspection scheme can be adopted: first conduct wide-range general screening with gamma-rays, followed by fine detailed inspection with X-rays to balance full coverage and detection accuracy.

 

Ruihang, as a direct manufacturer of titanium products, supply optimal quality raw materials for your precision components production. If you have any purchasing needs,please feel free to contact us via email: Sam.Rui@bjrh-titanium.com