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Ultrasonic testing of welds of small diameter tubes

So as not to leave a smooth surface of the pipe had grab a small plane, resulting in poor acoustic coupling units 2j coupling agent containing a number of boats in a more viscous oil, applied in moderation, should not be too thick. Clutter reflection occurs, identification of defects:. 6 compensation of surface roughness compensation. Probe tube should be measured on the actual. Generally 0 ~ 4dB when the curvature of the second wave detection refraction, scattering compensate for the amount of probe tube should be specifications, in the corresponding DB-l-type-specific small diameter tubes was determined on the reference block, generally 3 ~ 6dg. If, according to 42 × 5. S heater pipe specifications, in the corresponding DB-I-type test block Ba given by _ on the determination of a wave surface roughness lumbar compensation 2dB; second crossing NDT Compensation 8dB (bimonthly) 2001 1 3 deficiency waveform analysis 3.1 Weld defect detection with the first wave,ugg boots günstig, the reflected waves in a wave marker ago. Testing with the second wave, the reflected waves in a wave marker points and the second crossing point between markers. Should pay attention to distinguish between variant surface wave and the root variant is, and the remainder spread of the beam caused by the high reflection, can be contaminated with oil finger tapping and horizontal orientation whether the weld seam up verification. 3.2 weld toe defects when the biggest wave reflection in a marked point, the level of positioning the probe in the weld center or the side of right and wrong should be noted that the distinction between tumor edge and welding. Suspicious of the signal should be carefully observed to prevent miscalculation and missed. Defects can be cutting the roots were measured test block to verify the depth. If the DB-l-type reference blocks, the V-groove within the surface reflection wave 6O reference wave higher. 36dB gain and then as a lack of penetration weld toe,ugg stivali, concave and other defects in the contrast detection interference wave equivalent of 3.3, the screen reflection in addition to real defects, but also some false signals. These false signals sometimes interfere with the determination of true defects. Through careful analysis. Is able to distinguish between false signals. 3.3.1 The shape of the weld seam root drop-plasty good time. General non-reflected wave or the reflected wave intensity is weak; bad shape when the weld toe, from both sides of the weld root flaw general shape of the reflected signals are. Reflection waveform characteristics such as root penetration and to similar defects, forming the root of the reflected intensity with the reflection conditions posed by different, often ruled as not pay attention to defects, determine the difference in two ways: First,ugg prezzo, to compare from the sound path . Weld toe shape slightly larger than the reflected wave to appear dry a wave markers. At this time requires adjustment of scanning speed as accurately as possible; second difference from the horizontal positioning meters. Weld root level of the reflected wave shape deviation from the weld center line located in the side away from the probe. The lack of road roots level position should be defended by the seam in the center or off the side of the weld center close to the probe (see Figure 1). 3,3.2 wrong side of the reflection caused by the wrong side when crossing the present, will produce the wrong side of reflection. Basically, its level position in the weld center (see Figure 2). However, probing the other side of the weld. In the absence of reflection conditions. There is no signal. 3.3.3 Cambodia and caused more than diffuse sound waves caused by the detection of highly reflective wall thickness thin trail, when a wave behind the main spread of the sound beam through the bottom reflection Cambodia to weld reinforcement, the reinforcement will Department of reflection wave. Exactly at the time of the reflected waves and secondary waves crossing point of the question mark, and sometimes mistaken for the middle or upper part of the weld defects. According to the level of the probe position and orientation or oily finger tapping to identify weld reinforcement. Prince Yu Qi 1 root mat reflection and reflection contrast Nam dark side of anonymous z Margaret Cheng Ge reflection dip in 3.3.4 Citation weld toe deformation caused by the reflected wave when the sound found in the weld root in Cambodia when the sweep, under certain conditions will produce deformation wave, if the deformation waves through the weld reinforcement to return to the probe, the reflected wave and the wave just in time between the second wave markers, sometimes misjudge. According to the location and level of positioning the probe to distinguish between the general level of deformation localization transition point in the weld away. 4 Conclusion The detection of thousands of welded joint analysis, we believe that the weld ultrasonic inspection of small diameter tubes keep the following advantages: equipment from site, location restrictions, environmental ask for much, easy operation; can be carried out with other processes crossover operations, improve work efficiency; detection diameter tube welds with high reliability, can act as a trail camp and a major means of weld quality; comprehensive round-ray and acoustic testing of the two interesting cases,Moncler jacken, can be seen on defect detection rate is almost the same; can save a lot of manpower, material and financial resources, and reduce the detection of anti-j. Significant economic benefits that end, we have a variety of boilers, such as QXSI 6/28O-Yc type,Moncler online, QXS3.5-2o/14o/15o-YC Petrochemical private car special boiler plate on the butt weld pipe applications, technology has become as mature, I believe that the welding quality testing will play a greater role.

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