The answer is simple:

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poor design and inferior engineering.
Cracks don’t appear overnight. They form gradually as a result of stress concentrations, thermal fatigue, poor material selection, and incorrect structural geometry, all of which stem from unqualified or careless design work.

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In fact, many spiral elevators on the market begin to show signs of cracking within 3 to 5 years of use, sometimes even sooner in high-load or abrasive environments.

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Key design flaws that lead to cracking include:

• Improper Flight Thickness: Too thin for the expected load, resulting in fatigue and failure.

• Sharp Internal Corners: These create stress points that act as crack initiators under vibration.

• Inconsistent Welding: Weak or uneven welds deteriorate under repetitive dynamic stress.

• Material Mismatch: Using the wrong grade of steel or skipping proper heat treatment reduces resilience.

• Overlooked Vibration Frequencies: Lack of proper simulation causes resonance fatigue over time.