How To Weld A Pipe Flange

The connection with the pipe is done with 2 fillet welds as well at the outside as also at the inside of the flange. However I have not found solid reference for joining a fitting to greater wall thickness.

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In assembly of the joint before welding the pipe or tube shall be inserted into the socket to the maximum depth.

How to weld a pipe flange. When welding a flange fitting or a piece of pipe together the gap spacing for welding them is established by the Welding Qualification. The pipe schedule and the bore of the socket weld flange has to match so that there is no raised face there is no protrusion on the backside. ASME B311 Preparation for Welding E Socket Weld Assembly says.

Installation is slightly more technical as youll need fillet weld both sides to secure the flange to the pipe. The hole alignment is independent from the welding process and this means welders cant distort the face of the flange with hisher work. The cost of flange and fabrication is moderate.

This is the most commonly used flange for pipeline. In assembly of the joint before welding the pipe or tube shall be inserted into the socket to the maximum depth and then withdrawn approximately 116 16 mm away from contact between the end of the pipe and the shoulder of the socket. Our maintenance department wants to weld a ASTM A105 class 150 welded neck flange std to a ½ dia A53 schedule 80 pipe.

One fillet weld is executed on the inside and another on the outside of. According to ASME B311 to execute a flanged connection using a socket weld flange the pipe shall be at first inserted in the socket of the flange until it reaches the bottom of the flange then it should be lifted by 16 mm and finally welded. Pipe is welded to socket weld flanges by inserting the pipe into the socket and backing the piping out between 116 and 18.

Sliding the slip-on flange onto the pipe. Was wondering about the correct way to weld slip on flanges. This is to prevent the expanding pipe on the inner side of the weld from expanding when headed and cracking the weld on the fitting.

Welding Neck This flange again places the weld in an area away from the flange face and offers more strength against pressure and heat. Simply match the flange to the outer diameter of the pipe you intend to connect. As the name suggests slip on flanges are placed on pipes by sliding them into place.

This space is necessary to do not damage the flange face during the welding process. ASME B311 1998 1273 Preparation for Welding E Socket Weld Assembly says. Socket welded flanges shall be specified with connection pipe thickness to ensure proper bore dimensions.

On a socket weld its 116 and can be established with a special spring. Check for The Efficiency of The Slip-On Flange. Socket-Weld Flanges has a female socket in which the pipe is fitted.

These Flanges are welded only on outside of the Pipe. The pipe schedule this is a 2 inch nominal pipe and this is a standard schedule pipe and this is a standard schedule socket weld flange. Currently we recess the pipe about 18 to 14 in from the face of the flange and Tig weld the inside w 18 ER70s2.

The flanges are then fastened in place by two fillet welds. The first weld is at this point a fillet weld around the end of the pipe wall joining the end of the pipe and the interior opening of the flange hole. It is not recommended for high-pressure applications.

They are not used in severe services due to stagnation of fluid at the socket. METHODS OF WELDING FLANGES TO PIPE The methods used in welding flanges to pipe will vary according to the type of flange and are basically the same as those used in standard welding practices. On the socket weld flange you have to specify the pipe schedule.

Then we weld the outside of the flange to the pipe Tig root 18 ER70s2 and cover w 7018. For welding Neck and Lap Joint Stub and Flange applications an initial root gap spacing between pipe and flange should be 116 to 18. I have found sound technical reference for joining butt-welding fittings to pipe of equal or lesser wall thickness.

The X measure on the image are approximately. The connection with the pipe is done with 1 fillet weld at the outside of the flange. Generally it is used in small bore piping and only suitable for low pressure and temperature application.

Fillet welding is done from outside on the pipe. Wall thickness of pipe 3 mm. They are usually used in small bore piping where the piping specification is socket weld.

Then the flange itself with an opening the the OD of the pipe then the end of the pipe - recessed about 38 of an inch inside the flange opening. A weldneck flange tapers to the thickness of the pipe wall and then in welded directly to the end of the pipe in a single weld. Fasten the Slip-On Flange in Position.

Socket-Welded Flanges can be FF or RF. API Std 1104 Standard for Welding of Pipelines and Related Facilities calls for a 116 space.

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