SS 304 Socket Weld Flange

QS Flange: Suzhou Ss 304 Sw Flange

SS 304 socket weld flange for small bore pipe, with a recessed socket, an external fillet weld joint and a face type confirmed at inquiry.

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One-Minute Overview

Socket weld flange with a recessed bore that receives the pipe before welding.
SS 304 body keeps water, food and general chemical lines clear of rust.
Common on small bore lines where a fillet weld beats a butt weld.
Size, pressure class and facing are confirmed with you at inquiry.

An SS 304 socket weld flange joins a small bore pipe to a flanged connection by slipping the pipe into a machined socket and sealing it with an external fillet weld. The stainless body carries the corrosion resistance of grade 304 into the pressure boundary, so the joint holds up in water, food processing and general chemical service where a carbon steel flange would start to rust.

The pipe slides into the socket until it meets the shoulder, which squares the pipe to the flange face and holds the two parts concentric while the weld is made. A single fillet runs around the outside where the pipe enters the socket, so there is no internal weld bead to restrict flow and no bevelled end preparation on the pipe. Because the socket centres the pipe by itself, the fitter does not need a line-up clamp at every joint, which is why the type is common on small bore utility, instrument and drain lines.

Grade 304 stainless brings its chromium-rich surface to the wetted parts, so the flange resists the rust and staining that carbon steel picks up in water, washdown and light chemical exposure. The material also welds predictably with common stainless filler, and the finished joint can be passivated if the service calls for it. Selection is settled at inquiry: pressure class, nominal size, raised face or flat face, bore size for the pipe wall and the material documentation you need are all confirmed against your line data before the order is released.

Detailed specifications, dimensional drawings and material documentation for this socket weld flange can be provided on request, and our team will match the facing and bore to the flanges already on your line.

FAQ

Q1. What actually holds a socket weld joint together?

The pipe sits in the socket against its shoulder and a fillet weld runs around the outside where pipe meets socket. The shoulder squares the pipe to the face and the weld carries the load, so the joint needs no bevelled pipe end. Leave the specified expansion gap at the socket bottom so the weld does not crack as the line heats.

Q2. Why choose socket weld over butt weld on small lines?

On small bore pipe a butt weld needs a bevelled end, a line-up clamp and a welder working in a tight gap. The socket centres the pipe by itself, so fit-up is quicker and alignment is repeatable. For utility, drain and instrument lines the saving in shop time usually outweighs the extra metal in the socket.

Q3. Where does a 304 body make the most sense?

In water, washdown, food and light chemical service, where a carbon steel flange would rust and stain the line. Grade 304 keeps the wetted surfaces clean and welds predictably. It is not the answer for chloride-heavy or high temperature duty, so tell us the medium and we will confirm the grade with you.

Q4. What is the smallest order I can place?

Standard flange insulation gasket kits start at one set, and standard gaskets, studs, washers and sleeves start at one piece. Parts made to your drawing or to a non-standard bolt pattern are quoted one by one, because the minimum really depends on the material and the tooling involved.

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