What is a dresser coupling?
A pipe fitting used to connect two sections of pipe without use of threads. A dresser coupling is also known as a slip joint. ... A dresser-type coupling is an unthreaded fitting. Sleeves on the coupling slide over the pipe ends to which they are to be connected, rather than attaching by threads.
What are Victaulic fittings?
Victaulic couplings, or mechanical grooved couplings (also called mechanical pipe joining systems), are components that join mechanical pipes together to create a watertight joint. ... A flexible (often rubber) gasket is placed around both pipe ends, connecting them.
Who owns Victaulic Company?
Victaulic is privately owned in a 50% split by the Bancroft Family (former owners of the Dow Jones/Wall Street Journal), and the Royal Prince Pierre D'Arenberg of France.
What are grooved fittings?
Introduction to grooving A grooved mechanical joining of two pipes means that a small groove is made at the end of each pipe with a grooving machine. A rubber gasket is fitted over the two pipe ends and around it a two-part coupling is screwed together with two bolts and nuts.
What is pipe grooving?
The pipe groove is made by forming or machining an actual groove into the ends of two pipes. A gasket wraps around and on top of the pipe ends, the housings wrap around the gasket and sit in the pipe grooves, and the bolts and nuts are tightened with a wrench to hold it all together.
What is groove in mechanical?
In manufacturing or mechanical engineering a groove is a long and narrow indentation built into a material, generally for the purpose of allowing another material or part to move within the groove and be guided by it. Examples include: A canal cut in a hard material, usually metal.
What are the advantages of welded piping systems over other joining methods?
What are the advantages of welded piping systems over other joining methods? Last longer periods of time . Why must the ends of pipe be beveled before being welded?
Why must the ends of pipe be beveled before being welded?
When the wall thickness exceeds 3 mm, the weld puddle will become too large for controlling its geometrical behavior. In this case a J bevel is necessary in order to obtain wall thicknesses that can be welded easily.
How can the ends of a pipe be beveled?
There are various ways to bevel a pipe. Using portable or stationary beveling machines, doing it by a hand grinder, or by a plasma or torch cutter. The hand grinding method of beveling is the cheapest and the most dangerous method compared to using a beveling machine.
How can a small gap between the plate and backing strip be removed?
How can a small gap between the plate and backing strip be removed? a- By heating the plates with a torch and squeezing them together in a vise.
Why backing strip is used in welding?
The use of ceramic backing strips enables welding to be carried out from a single side, with full penetration and reduces (and often removes) the need to grind out and re-weld a root from the reverse side. The strips are available in a range of configurations for differing applications and resulting weld bead shapes.
What position is the 2F lap joint in?
Horizontal Position (2G and 2F) As for the face of the weld, it should lie in an approximately vertical plane. 2F is a fillet weld position, in which the welding is done on the upper side of the surfaces that is approximately horizontal that lies against a surface that is approximately vertical.
What arc problems can occur in deep or narrow weld joints?
What arc problems can occur in deep or narrow weld joints? the arc is pulled to one side and not to the root. Describe the difference between using a leading and a trailing electrode. a leading electrode angle pushes the molten metal and slag ahead of the weld.
What controls the size of the arc?
The measurement of total number of electrons flowing, in the same way that gallons is a measurement of the amount of water flowing. This controls the size of the arc. The electrons change direction every 1/120 of a second so that the electrode and the work alternate from positive to negative.
What are 2 ways to strike an arc?
There are two general methods of striking the arc: Scratching. Tapping.
What are the effects of too high or too low current setting?
If current on equipment is too high or too low, you are certain to be disappointed in your weld. If too high, the electrode melts too fast and your molten pool is large and irregular, if too low, there is nor enough heat to melt the base metal and your molten pool will be small, will pile up, look irregular.
What is the effect of long arc?
Arc Length Too Long Arc welding is a constant current process, but the arc length has an effect on voltage. Reducing the arc length will decrease the voltage, and this reduces the heat in the weld. Increasing arc length will increase the voltage.
What are the three types of fillet joints?
The 3 types of fillet joints are tee, lap and corner joints.
What is the normal arc length?
Length of arc: The correct arc length varies with each electrode and application. As a good starting point, arc length should not exceed the diameter of the metal portion (core) of the electrode. For example, an 1/8-inch 6010 electrode is held about 1/8 inch off the base material.
What is short arc?
Short-arc welding is a method of MIG welding \"MlG\" is short for \"metal inert-gas\" It is also referred to as \"gas metal-arc welding \" The process consists of feeding a continuous consumable wire electrode at controlled speeds through a gas-shielded torch The process involves a series of periodic short circuits ...
Can you touch the metal you are welding?
Do not rest your body, arms, or legs on the work piece (the metal being welded), especially if your clothing is wet or bare skin is exposed (and it should not be if you are dressed properly). ... Do not touch the electrode or metal parts of the electrode holder with skin or wet clothing.
What are the indications that the arc length is too long?
Excessive spatter is an indication that arc length is too long, welding current is too high, polarity is not reversed, or there has been absorption of moisture by the electrode coating.
What may happen if too short of an arc length is used?
it will adversely affect the weld, as it is shortened, metal transferring across the gap may short out electrode cause to stick to the plate. As the arc lengthened, the metal being transferred may drop outside of the molten weld pool, and weld is wider and has little build up.
What type of weld is the 1F T joint?
Flat Position (1G or 1F) This type of welding is performed from the upper side of the joint. The face of the weld is approximately horizontal. Flat welding is the preferred term; however, the same position is sometimes called downhand.
Which is not a requirement for the SMAW process?
|Term What is not a requirement for the SMAW process?||Definition Gas Supply|
|Term ELectric current is transferred to the electrode through the...||Definition contact tube|
|Term what shielding gas or gas mixture with not produce spray transfer?||Definition 100% Co2|
How many basic types of joints are there in welding?
Which type of joint is the groove weld used on?
What type of weld is generally used for thin metals?
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