Welding is one of the primary and most essential industrial works of the present times. Various types of metals are being used in every field and without welding, it would be impossible to convert the sheets of metal into our desired forms. From a simple metal gate in your house to a huge aircraft, everything comes into existence only because of the perfect, craftsman-like welding offered by the experts.
In the recent times, the need for welders has increased manifold. From tiny bits of household works to developing fancy cars, a welder plays an important part. Not only that, many people these days take up DIY welding projects to decorate and build their own house or property as they would like to.
But before you start the welding work, it is important that you know the symbol guide in welding metal. This is extremely important when you are aspiring to become a professional welder where you need to work with a number of other co-welders, and these symbols will help you and your co-workers to communicate in the best way. Reading symbol is also necessary if you are working on a DIY project with other members of your family or your friends who may be helping you out in the procedure. Knowing these symbols ensure that the welding work is carried out in the most professional manner, and there is no confusion at all.
Guide to reading symbols
For those who want to take part in serious welding, professionally or otherwise, it is important that they know the symbols by heart. To make things easier for you here is a symbol guide in welding metal that will make you accustomed to the professional symbols being used during welding.
- Reference line (Single) – It is a horizontal line and forms the arrow body. All other specifications are decided with respect to the reference line.
- Reference line (Multiple) – Many reference lines are used when operations are to be carried out in a sequence. A reference line that is closest to the arrow will indicate the starting operation and the line which lies furthest will represent the operation to be carried out at last.
- Arrow – The arrow may be drawn on any of the ends of the reference line and should touch the line which represents the joint to be welded.
- Tail – A tail may or may not be used while welding. It is useful only when you have to mention specifications with the diagrams.
- Weld symbol – This will represent the weld type to be implemented. Weld types are – bead, fillet, slot or plug and butt or groove (V, Square, Bevel, J, U, Flare Bevel and Flare V)
- Arrow side – The side that is touched by the arrow.
- Other side – The surface of the metal that faces away from the arrowhead.
- Root opening – Describes the space that is left at the bottom between pieces or in the region of the joint root.
- Groove angle – Represents the total or included angle when a groove-shaped weld is inserted.
- Contour symbol – Indicates the contour or shape of the weld after welding is complete. Usually represented by a straight or a curved line.
- Finished symbols – They indicate the finishing procedure. The following are the most important methods:
- Bevel depth – The bevel depth is indicated by the position of “S”.
- Groove Weld size – This is usually mentioned within parentheses present along “E” position present in welding symbol. It represents the depth of the penetration of the weld into the metal to be welded.
- Weld Length – In the case of intermittent welds, each weld’s length is indicated by length dimension.
- Weld pitch – Represents the distance that exists between the centers of two consecutive welds.
Backing weld – This symbol is used to acquire complete penetration in case welding can be done on both surfaces.
- Melt-through – This symbol is placed when welding is done from one direction only and 100% penetration in needed.
- Weld-All-Around – This symbol represents the use of the same weld type at all joints.
- Field weld – Indicates that welding would be carried outside the shop.
Learning about the symbols makes your task simpler and communication easier. All you need to do is use the right symbols in the right place, and the welding process would be as smooth as it can be.