A weld neck flange (also known as a high-hub flange and tapered hub flange) is a type of flange.

The Welding neck flanges is normally referred to as the high hub flange. It is designed to transfer stresses to the pipe, thereby reducing high stress concentrations at the base of the flange.

A weld neck flange (also known as a high-hub flange and tapered hub flange) is a type of flange. There are two designs. The regular type is used with pipes. The long type is unsuitable for pipes and is used in process plant. A weld neck flange consists of a circular fitting with a protruding rim around the circumference. Generally machined from a forging, these flanges are typically butt welded to a pipe. The rim has a series of drilled holes that permit the flange to be affixed to another flange with bolts.

Flange material

Forged steel flanges made of carbon steel or stainless steel, the materials conform to the JIS, ASTM A182,A105, DIN17100 ST-2 and BS standard. Dimension to be in accordance with JIS ANSI DIN BS standard accordingly.

WCB (carbon steel), LCB (low temperature carbon steel), LC3 (3.5% nickel steel), WC5 (1.25% chromium 0.5% molybdenum steel), WC9 (2.25% chromium), C5 (5% chromium 0.5% molybdenum), C12 (9% Chromium 1% Molybdenum), CA6NM (4 (12% Chromium Steel), CA15 (4) (12% Chromium), CF8M (316 Stainless Steel), CF8C (347 Stainless Steel), CF8 (304 Stainless Steel), CF3 (304L Stainless steel), CF3M (316L stainless steel), CN7M (alloy steel), M35-1 (Monel), N7M (Hast nickel alloy B), CW6M (Hasta nickel alloy C), CY40 (Inconel) Wait.

Flange welding process

Required equipment

A set of manual welding equipment, a handle angle grinder, an electric hammer, a flat surface.

Prepare for welding

1. Check the debugging equipment to ensure the normal operation of the equipment;

2. Prepare φ4.0J402 electrode for best drying at 300°C-350°C for one hour.

Welding process

1. Assembly The vertebral body and the large flange are assembled together according to the requirements of the drawings, and the flange is divided equally into 8 equal parts.

2. Because the flange is thicker and the groove is larger, it adopts segmental symmetry and multi-layer welding.

Weld quality

The weld strength is required to be at least that of the base metal. The surface of the weld is smooth and smooth, with no defects such as burn-through, porosity, weld leakage, slag inclusion, undercut, and full welding. The remaining height is less than 2mm.

Precautions

1. Be sure to use the J506 electrode for hand build-up and make use of low current welding. In strict accordance with the welding process welding.

2. After each welding position, use the horizontal ruler to check the deformation of the flange plane.

3. One side of the welding side is hammered with a pneumatic hammer to achieve the effect of eliminating stress.

The above is a description of the relevant material of the flange material, and I hope to help you. For more information on flanges, please continue to pay attention to information on this site.

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