SAE J527 kobberloddet bundy stålrør

Brazed Double Wall Carbon Steel Tubing.
Covers copper brazed double wall low carbon steel tube intended for general automotive applications and other similar uses. Suitable for bending, forming and double flaring.

Bundy tubes are fully monitored during the tube fabrication, and also gone through a series of inspections to make sure they are safe and reliable for hydraulic uses.

Test and inspection items specified in standards of different countries are generally the same or very similar. We manufacture the tubes and issue test reports as per Chinese standard if no other particular requirement comes from buyers.

One thing to note is that the material listed in those standards are slightly different among countries. Low carbon steel is required commonly, but the chemical composition of the material varies, especially for carbon. In most of these countries, the steel grade exists already in their steel industry. In China, there is equivalent steel grades, but we specially developed a steel grade, BHG2, that is much more suitable for the double wall brazed steel tubing manufacture, perfect mechanical properties for the tube forming and also for the final tubes.

When tube is formed and brazed in the continuous production line, instant Eddy current automatic inspection system keeps detecting any potential imperfections of inner structure of the tube. Once the imperfections are detected, they will be automatically shown and notified by the system:

1. An alarm sound is triggered and broadcast by a loud speaker.
2. A flashing alert light on the machine shall be turned on.
3. An automatic online printer shall mark the tube sections with imperfections with ink, then the imperfect tube sections shall be cut and removed.

The following tests shall be done to make sure the tubes are suitable for hydraulic applications of automobiles.

1. Tensile test.
2. Hardness test.
3. Bending test.
4. Expansion test.
5. Developing test.
6. Flattening and bending test.
7. Pressure-proof test.
8. Burst pressure test.

The following tests shall be conducted to determine how the surface coating/plating performs when protecting the tube from corrosion.

1. Coating/plating thickness test.
2. Corrosion resistance test (neutral salt spray, i.e. NSS).
3. Film performance test (varies according to coating/plating types).

Bundy rør, også kaldet Bundy rør, er et dobbeltvægget kobberloddet stålrør. Fremstillingen af Bundy-rør er en kontinuerlig proces med at rulle en kobberbelagt stålbånd igennem 720 Grader, Stammens ydre og indre cirkel loddes sammen af det smeltede kobberlag til dannelse af et rundt rør med en kontinuerlig cirkulær søm, og udglødning. Vi bruger fuldautomatiske produktionslinjer med online procesovervågning og kontinuerlig fremstilling af Bundy-rørene.

1.En kobberbelagt stålstrimmel trækkes ind i de primære rørruller, og blive 720 grader indpakket efter at have gennemgået et sæt ruller.

2.Derefter går det indpakkede rør ind i svejsekammeret, hvor rørene loddes. Temperaturen i kammeret styres over kobbersmeltetemperaturen, Så kobberlagene smeltes og spredes ind i ståloverfladerne. Røret opvarmes her i kammeret med beskyttelsesgas fyldt, så der ikke er nogen oxidering af kobber eller stål, og der vil heller ikke blive efterladt vand for at undgå rust.

3.Efter svejsetrinnet, røret går ind i kølesektionen, hvor det bliver køligere, og det overvåges også online samtidigt af Eddy-strømscanningsenheden. Enhver unormal sektionsform eller svejsning uden sømme vil blive observeret fra skærmen.

4.Rørene vikles endelig for let at blive pakket og fyldt.

Denne proces med Bundy-rørproduktion, sammenlignet med andre metoder, er bredt accepteret for sin høje produktionshastighed, men alligevel øjeblikkelig overvågning af svejsekvaliteten.

Hvis der er spørgsmål,Du er mere end velkommen til at kontakte sales@grandsteeltube.com