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IALBRO 237 MF

Unitor IALBRO 237 MF is a flux-coated filler rod for TIG welding of aluminumbrass pipes also known as Yorcalbro pipe. This alloy is widely used in seawater resistant piping. In TIG welding of joints it is strongly recommended that I-Flux 238 PF is applied to both sides of the joint and on the inside. This improves welding penetration considerably. Flux deposits must be washed off with water.

– Completed welds, as well as the area covering approx. 15 cm on either side of the bead should be annealed. Annealing temperature 300–400°C for 30–40 min.

Yorcalbro pipes with diameter less than 4" can be joined by means of overlap joint (capillary action) and silver brazed using Unitor AG-60 combined with Albro Flux 263 PF. Larger pipes should be TIG welded using Unitor IALBRO 237 MF.

In cases where this is not possible, position welding may be used with Leftward welding technique.

– Use a contact thermometer when annealing Yorcalbro pipes. Whenever possible, welding should take place in the workshop, in the horizontal position.

Typical applications

Welding procedure:

Also use I-flux 238 PF inside pipe joints

– Piping must be unstressed before welding.

– Cold bent piping should be annealed at 400–500°C for approx. 20–30 min.

3.02

– As a general rule, pipes with a thickness up to and including 1.5 mm may be butt welded with a 1.5 mm aperture, no V-groove being necessary. For thicknesses exceeding 1.5mm, a 70° V-groove with 1.5 mm root gap is recommended. – Thoroughly clean the welding area with a steel brush or emery paper.

Permanently installed pipe.

Horizontal axis.

– Strike the arc on a separate piece of metal placed close to the weld zone.

– Weld in long continuous beads as quickly as possible. When the arc is extinguished the groove must be cleaned before the bead is continued. – Base material temperature during welding should never exceed 150°C

Permanently installed pipe.

Vertical axis.

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