Everyone knows that during the production of cold-drawn steel pipes, there will be oil stain, oxide scales produced by welding and some other dirt. The outer wall is better cleaned: if it is oil stain, it can be washed with organic solvent or alkali solution, if it is rusty, then use special rust remover. But how to clean the inner wall thoroughly? Today we will introduce it to you. If the cleanliness requirement is high, use ultrasonic to clean: 超声波清洗原理：超声波在液体中传播时的声压剧变使液体发生强烈的空气现象，每秒产生数百万计的微小空化气泡，这些气泡在声压作用下急速地大量产生，并不继地猛烈爆破，产生强大的冲击力和负压吸力，足以使顽固的污垢迅速剥离。
Principle of ultrasonic cleaning: When ultrasonic wave propagates in liquid, the sharp change of sound pressure makes the liquid produce strong air phenomenon. Millions of tiny cavitation bubbles are produced every second. These bubbles are produced rapidly in large quantities under the action of sound pressure, and then blasted violently, producing strong impact force and negative pressure suction, which are enough to make the liquid stubborn. The dirt peeled off quickly.
If the cold-drawn steel pipe is relatively long and has its own sink, you can buy an ultrasonic vibration plate and put it into the water for ultrasonic cleaning. If it is not too long, you can use an ultrasonic vibration rod and insert it into the pipe for cleaning, and then rinse off the filth peeled by the ultrasonic wave with running water.
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