How to check the glue bonding capacity

After bonding with glue, good or bad its adhesive quality testing methods which are listed below?:

◆ acoustic impedance detection method: the use of anti-acoustic impedance detectors to measure changes in the mechanical resistance of the adhesive joints, if the bond is defective, the measured impedance will sharply.

◆ ultrasonic flaw detection method: the use of 106 orders of magnitude ultrasonic testing for adhesive joints, bonded joints if there is a gap and bubbles and other defects, these defects ultrasound crossing will be reflected back.

◆ testing method LCD: liquid crystal (cholesteric material) and the filler is applied when using the adhesive surface of the joint, and then rapidly heated uniformly, the adhesive layer when the joint has defects, the temperature rises quickly,

Is reflected in the color of the liquid crystal is different.

The above three methods is the detection of large projects on the instrument, the accuracy is high.

◆ The most intuitive way to visually law: whether observed after light curing adhesive flat extrusion, plastic extrusion seam and I glue is uniform.

◆ The easiest way, percussion method: When testing the adhesive surface with a metal rod continuous percussion, such as occurred around the same loudness and large, the better the quality of bonding; contrary, such as certain local development

The voice is uneven, short duration and have hollow sound, it indicates that the site is not good adhesive quality.

These two methods of construction workers during operation can be simple to identify, but to a high degree of precision, then you need to use precision instruments to test