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2026-09-08
Worn clamping pads not only fail to perform their function but also directly damage the steel pipe workpiece. The types and causes of such damage are as follows:
1. Localized grooves and surface irregularities on the pad
Prolonged clamping causes indentation pits and grooves to form on the pad. During clamping, localized stress concentration at contact points creates indentations or pits on the steel pipe surface; for galvanized pipes, this leads to cracking of the coating and zinc flaking.
2. Surface hardening, cracking, and fragmentation of the pad
As polyurethane or rubber pads wear and age, their surfaces harden and develop cracks. The hard, jagged edges of these cracks act like knife blades, directly scratching or abrading the outer wall of the steel pipe during clamping, resulting in scratch defects on the finished pipe.
3. Slippage and relative friction during clamping
Pad wear reduces friction, causing slight slippage when gripping the pipe. Relative movement between the pipe and the pad results in extensive scuffing and abrasion marks on the pipe wall, as well as the wearing away or detachment of the galvanized coating.
4. Pad worn through, exposing metal components to the pipe
Failure to replace excessively worn pads allows the metal base of the clamping jaw to make direct, hard contact with the steel pipe:
Black steel pipes suffer from indentation pits and gouges;
Finished galvanized or painted pipes sustain severe impact damage and metal transfer marks, rendering them immediately non-compliant.
5. Uneven pad wear and inconsistent thickness
Severe unilateral wear or uneven thickness between opposing pads causes the pipe to be clamped at an angle. This subjects the pipe to localized stress overloads, making it prone to crushing indentations and rotation within the clamp, which results in spiral-shaped scratches on the pipe wall.
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