Butt Weld Cross

Butt Weld Cross is general professional term as connections of pipe fittings and pipes, which is used for a branch pipe in the main channel. It is named due to the four ends can be connected with pipes. It is made by bulge forming.

Specification:

Technology: Bulge forming
Size: Seamless 1/2"-24"(DN15-DN600)
Welded 1/2"-48"(DN15-DN1200)
Standard: ASMEB16.9,DIN2605,JISB2313,GB/T12459,GB/T13401,SH3408,SH3409,

HG/T21635,HG/T21631,MSS SP-43
Thickness: SCH5S-SCH160
Materials: 317/L,304/L,316/L,310/S,309/S,347/H,321/321H,904/L,S32750/F53/SAF2507,

S32205/F60 S31803/F51,S32760/F55

The Process of bulge forming of stainless steel butt weld pipe fittings:

1.Press the tube blank larger than the diameter of the cross to the size of the diameter of the cross, and open a hole in the portion of the stretching branch pipe;

2.The tube blank is heated, placed in a forming mold, and a die of the tensile branch tube is put into the tube blank;

3.The tube blank is radially compressed under the action of pressure, and the metal flows toward the branch pipe during the radial compression and forms a branch pipe under the drawing of the die.

4.The entire process is formed by the radial compression of the tube blank and the stretching process of the branch portion. Different from the hydraulic bulging four-way, the metal of the bulge formed cross branch pipe is compensated by the radial movement of the tube blank. Since the cross is compressed after heating, the tonnage of the equipment required for material forming is reduced.

5. The bulge formed cross has wide adaptability to materials, and is suitable for materials of low-carbon steel, alloy steel, and stainless steel. Especially the large-diameter and thick-walled cross is usually used in this forming process.

End Prep:

Beveled Ends

Squared Ends

Flanged Ends

Cut Grooves

Grooved Ends

Threaded Ends (Male & Female)

General points for good welds include:

1.Always start with clean and properly weld prepped components.

2.For internal welds, minimize warping by using only enough heat for 60-75% penetration.

3.For external buttwelds, make sure they are 100% penetration with no internal cracks or crevices.

4.Do not weld internally then externally around the entire circumference of the fittings.

5.Make sure there is little or no gap between pieces to be welded.

6.Ensure that all surfaces affected by the heat of the weld, especially the vacuum side, are purged properly with inert gas.

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