The Inspection Of Titanium Plates

As a core semi-finished product of titanium alloy processing, the quality of titanium plates directly determines the safety, reliability, and service life of end products. Titanium plate inspection needs to cover multi-dimensional aspects,such as chemical composition, mechanical properties, appearance quality, and internal defects. Meanwhile, combined with the characteristics of titanium materials such as easy oxidation and sensitive structure, we need to adopt scientific inspection methods and standardized operating procedures.

 

 

 

 

Data Verification: Verify that the information in the quality certificate is consistent with the actual titanium plates, check the production records, and clarify the key inspection points.

 

Environment and Personnel: The environment should be temperature-controlled at 15-35℃, with humidity ≤ 65% and clean without corrosion. Operators must hold relevant certificates, take protective measures, and avoid direct contact with titanium plates.

 

Equipment and Consumables: Calibrate various instruments before inspection, confirm the compliance of flaw detection agents, and prepare special sharp consumables to prevent sample deformation.

 

 

(I) Skills for Appearance and Dimensional Inspection

Oxide Color Judgment Skill: Mild oxidation and severe oxidation can be distinguished by the "wiping test" - wipe the surface with a clean cotton cloth dipped in anhydrous ethanol. Mild oxide color can be removed by wiping without residual indentations; severe oxide color cannot be removed and is accompanied by surface roughness, requiring further testing of the oxide layer thickness.

 

Rapid Thickness Uniformity Detection: For large-area titanium plates, the "grid point method" can be used for measurement. First, draw a uniform grid on the plate surface, then measure according to the grid points. This method not only ensures the representativeness of the measurement but also avoids missing tests. When measuring thin titanium plates (thickness ≤ 1mm), a digital micrometer should be selected, and the zero point should be calibrated before measurement to prevent plate deformation due to excessive pressure.

 

(II) Skills for Chemical Composition and Microstructure Inspection

Spectral Detection Skill: When grinding the surface oxide scale, use fine sandpaper (800 mesh or above) for gradual grinding to avoid scratches left by coarse sandpaper affecting spectral absorption. During detection, the probe should be closely attached to the sample surface and kept stable. Each sample should be tested 2-3 times, and the average value should be taken to reduce random errors.

 

Metallographic Etching Skill: During the etching process, real-time observe the color change of the sample surface. When the surface shows a uniform light gray color, immediately rinse it with clean water, dehydrate and dry it with anhydrous ethanol to avoid excessive etching leading to blurred microstructure details. For duplex titanium alloys, the α-phase and β-phase can be clearly distinguished by adjusting the etching time.

 

(III) Non-Destructive Testing Skills

Ultrasonic Flaw Detection Anti-Interference Skill: The edge of titanium plates is prone to generate reflected interference signals. During flaw detection, keep the probe at a distance of more than 5mm from the edge or use the edge compensation function. For titanium plates with rough surfaces, soft film probes can be selected to reduce signal attenuation caused by poor coupling.

 

Penetrant Flaw Detection Defect Identification Skill: After development, distinguish "false defects" from real defects - false defects are mostly blurred marks caused by surface oil stains and residual impurities, which can be eliminated by re-cleaning and repeating flaw detection; real defect indication lines are clear and continuous, and their extension direction is related to the processing texture.

(IV) Sample Processing Skills

During the cutting and grinding of titanium plate samples, high temperature should be avoided. Control the cutting speed during wire cutting and cool it in time; adopt wet grinding (cooling with water) during grinding to prevent surface oxidation. For mechanical property samples, the surface roughness after grinding should be controlled at Ra ≤ 1.6μm to avoid stress concentration during testing caused by surface scratches, which may affect the judgment of fracture performance.

 

 

Inspection Data and Reports: Timely sort out data and fill in inspection reports. Fully record inspection items, test results, equipment, personnel, and time to ensure the traceability of reports.

 

Qualified Product Handling: Mark the batch and qualified identification on the surface, store them classified to avoid mixing, and take moisture-proof and anti-oxidation protection during storage.

 

Unqualified Product Handling: Clearly mark the type and location of defects, store them separately and promptly feed back to the production department; analyze the causes of unqualified products, and formulate rectification measures.

 

Process Optimization: Regularly conduct statistical analysis of inspection data and optimize the inspection process in a targeted manner .

 

With over 13 years of experience in titanium product manufacturing, we provide a complete range of titanium plate grades to meet your specific requirements. For further product details, please contact us at: Sam.Rui@bjrh-titanium.com