Posted by Jeffery Wright on | 1 Comment

Taking a Closer Look at Forming Methods

A lot of claims are being circulated about the superiority of hydro formed hose. Like many such claims, however, closer inspection reveals the truth of the matter: Hydroforming is just one of many proven methods of corrugating tubing. Each forming method has its unique characteristics, and each product should be evaluated in terms of desired final hose capability, not generalized forming specifications. For example, light-duty, thin-wall hose can be more easily corrugated via hydroforming than by full mechanical forming. However, thin-wall hose sacrifices ruggedness, higher-pressure capability, and increased corrosion life. Heavy-duty industrial-grade hose can be formed at high speeds and with excellent quality via full mechanical methods.

The most important consideration in selecting a corrugated hose is the consistent quality and durability of the product and the proven track record of support provided by the manufacturer. Precision Hose & Expansion Joints outline some of the differences between the hydroforming and mechanical forming of corrugated hose.

COMPARISON OF FORMING METHODS: PLUS & MINUS

HYDROFORMING

  • Irregular convolution pattern.
  • Reduced fatigue life due to irregular convolution pattern.
  • Internal tooling can score hose I.D.
  • Risk of hydroforming fluid residue on I.D.
  • No forming cold work (strengthening) occurs at the convolution root; base metal thinning occurs at the crest.
  • Internal arbor limits length of continuous corrugations.
  • Metal thickness and profile height limited by hydroforming process.
  • Base metal thinning can occur if forming pressure is not 100% stable.

MECHANICAL

  • Uninterrupted continuous convolutions for the entire indefinite length of the annular hose.
  • Uniform convolution pattern.
  • Uniform O.D. more consistent cycle life.
  • No internal corrugation tooling.
  • No forming fluid used.
  • Rolling tooling strengthens root area of convolution; no metal thinning occurs at crest.
  • Hose length not limited by length of welded tubing. (Continuous welding and corrugating process. ¼” – 4”)
  • Heavier wall and higher profile possible using mechanical process.

Precision Hose & Expansion Joints manufactures the highest quality corrugated hose and braid. We are located in Stone Mountain, GA, and provide a wide range of precision industrial products. If you need help selecting which corrugated tubing for your project, contact Precision Hose & Expansion Joints today! We ship all products both domestically and internationally.

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