Posts Tagged ‘weld’

Welding joints and its basic types

Wednesday, June 2nd, 2010

When you are learning how to weld, you first need to study the types of welding joints there are. The main reason you have to learn these joints as if you are on a big job and you have to study the blueprints you will require to know the symbols and the name of the weld joint to be capable to situate the part that needs a weld on it.

The 5 weld joints are called Butt joint, Corner joint, Edge joint, Lap joint and Tee joint. The first one called Butt joint is a joint that is between two members lying around in the same plane. The second one named Corner joint has two members placed at right angles to each other in a form of an angle, generally 90 degrees. The third one named Edge joint is a joint between the ends of two or more parallel members. Fourth one is a Lap joint, which has two overlapping members to form the joint. Fifth one is the Tee joint; it looks just like it is called because it forms a “T”.

When you produce weld ments, it is essential to combine types with weld types to produce welds. And they will produce a name like, prepare welds, plug or slot welds, spot or projection welds, seam welds and the listing goes on and on.

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Posted in Mig Welding, Welders | 1 Comment »

General idea about Resistance or Friction Welding

Tuesday, June 1st, 2010

Resistance or Friction welding are two welding methods that fit into a group of processes that functions with a work piece that is moving and another piece that remains stationary. In the process heat is generated through friction as the two pieces comes mutually and an upset (a side force) displaces and fuses these materials.

Friction welding is normally used with thermoplastics and with additional metals and is used a lot in the aviation and automotive industries. In friction welding there is no melting and the heat is bound for to the weld border. These generate a small heat zone. Also, as the friction is happening it cleans the exterior of the materials to be welded so the welder does not have to arrange the surfaces before welding.

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Posted in Welders | 3 Comments »

Submerged Arc Welding and its Benefits

Saturday, April 10th, 2010

One of the most familiar welding techniques is the Submerged Arc Welding (SAW). It is significant to note that this was one of the first types of welding to get a patent.

There are numerous advantages in using SAW which include:

• It has a high deposition rate and it can pierce the weld deeply.
• Distortion is avoided to the maximum.
• When you have premeditated a good process and you have control over what you are doing you can be confident that you get a strong weld.
• You can actually do this with thin sheets of steel and they can be performed at a higher speed.
• You can perform this indoors or outdoors.
• There are very negligible fumes or arc lights which makes this a safer process.
• You don’t get any sprinkle on the weld because the arc is always under the blanket of flux.

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Posted in Arc Welding | No Comments »

The Basics of Metal Core Wire

Thursday, January 29th, 2009

Metal core wire is a fairly new type of wire that some welders are using for specific projects. This is a tubular electrode and it has a core with a variety of powdered materials and a metal sheath.

When comparing solid wire and tubular wire it is easy to see why some welders use it for specific project. Part of the difference between the two is where the welding current resides. On solid wire the entire section will carry the welding current while with metal core wire the current is only concentrated on the sheet that is outside. The metal powders are granular so they are less conducive to the weld.

The welder will get a more bowl shaped arc when using tubular wire and it will create a finer melting of the metal and the weld pool will be less turbulent.

Why Welders Use Metal Core Wire

This type of wire is more cost effective than other wires because for ever pound of weld metal they save between $100 and $200. This wire has little splatter and there is no slag associated with it. Using burn-through a welder can bridge partial gaps between metals which cannot be done with other types of wire.

When purchasing metal core wire it will be a little more expensive but in other types of wires, filler metals make up at least 10% of the cost. With this wire the welder will have an increase in productivity which balances out with the cost of the wire.

Welders can also weld thinner materials at higher amperages when they need to without worrying about the metals burning through each other. Larger electrode diameters can be used since the metal core wire is made up of metal and granular powder.

Applications for Metal Core Wire

There are a variety of projects that are best done with metal core wire. Some of these include:

  • When you have a project that you would normally use single wire with but the weld is more than 3 inches long and you will only make single pass over the metal.

  • When you are in the horizontal or flat position and you are using spray transfer.

  • When automatic welding is being used or where robotics will make a multiple pass through the metal.

Metal core wire will give a strong fusion especially when you want to bridge a gap or help to eliminate a cold lap.

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Posted in Welders | 5 Comments »