Changzhou Joyruns Steel Tube CO.,LTD
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Brazed Double Wall Zinc-coated Bundy tube used for Compressor
The manufacture of double-wall brazed steel tube uses steel sheets that have copper coated on both sides, so it has copper on both inside and outside surfaces as the original surface finish; while to manufacture the copper-coated single wall ERW steel tubes, steel sheets shall be coated with copper on the inside surface, rolled and welded, and then coated with copper on the outside surface finally.
Double-wall copper brazed steel tubing, also know as Bundy tube or Bundyweld tube, is the economical alternative to the seamless tube. It has many of the same qualities as seamless tubing and is suitable for most high-pressure applications.
High Dimensional Accuracy
Satisfying Mechanical Properties
Clean Inside Surface
We are offering Bundyweld tubes of regular sizes and at the same time capable of fabricating tubes of customized sizes.
Manufacture Standards
For Bundy tube manufacture, general standards of China, the US, Japan and other countries are very similar and replaceable and our tubes meet all of them, except that the material compositions are slightly different among countries.
China YB/T 4164
Japan JASO M101
Russia GOST 11249
Tube Application
Automotive Hydraulic Brake Lines
Automotive Power Steering Lines
ACR Coolant Transmission Lines
Other Heat Exchanging Equipment
Other Fluid Transmission
Inspection
Eddy Current (Non-Destructive) & Visual Inspection
Flattening & Bending Test
Expansion & Flaring Test
Tension Test
Inside Surface Cleanliness Test
Pressure Proof Test
Brazed Double Wall Tubing
Double-wall tubing is produced by roll forming copper-coated carbon steel strip into a double wrapped tubular shape as shown in the cross-sectional diagram. The formed tube is passed through a controlled atmosphere brazing furnace where it is fused together to produce a sealed tube. Double-wall tubing is ideally suited for use in applications that are subject to high levels of vibration and fatigue, such as household and commercial refrigeration compressors.
Single-Wall Steel Tubing with the same coating range as double-wall tubing but with the addition of a nickel-coated internal diameter to withstand the corrosive environment created by modern-day fuels.
Single & Double Wall Steel Tubing Bundy tubes that can be combined with an extensive range of corrosion- and abrasion-prevention coatings such as NyAl (aluminum and polyamide coating), NyZinc (zinc and polyamide coating), NyGal (Galfan and polyamide coating), PVF and many others. These tubes can also be provided with a polypropylene jacket to provide outstanding abrasion resistance.
Single and Double Wall Bundy Tubes
| Type | Double Wall (TDW) | Single Wall (TSW) |
| Welding Technique | Copper brazing | High-frequency ERW |
| Resizing Method | Cold drawn | Cold drawn |
| Seam | 720 Degree seamless | Straight-line seamed |
| Dimensional Accuracy | High | High |
| Strength | Mostly made hard | Can be soft or hard |
| Inside Cleanliness | Good | Poor |
| Vibration Resistance | Strong | Poor |
| Safety against Pressure | High | Low |
| Application | Automobile brake lines, fuel lines, transmission cooler lines, power steering lines; certain hydraulic pipes, etc; | AC, refrigeration, heat exchangers, automobile fuel lines; compressors, etc; |
| Original Surface | Copper | None (steel) |
| Surface Coating | Copper Zinc GALFAN |
Copper Zinc |