Welding Weld Joints and Symbols in engineering drawings
Welding Weld Joints and Symbols in engineering drawings
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Welding Weld Joints and Symbols in engineering drawings
Welding symbols
Introduction
Welding is an effective method of making permanent joints between two or more metal parts. Cast iron, steel and its alloys, brass and copper are the metals that may be welded easily. Production of leak proof joints that can withstand high pressures and temperatures are made possible with advanced welding technology. For this reason, welding is fast replacing casting and forging wherever possible. When compared to riveting, welding is cheaper, stronger and simpler to execute at site with considerable freedom in design. Hence, it is widely used in ship building and structural fabrication in place of riveting.
Weld Joints and Symbols
Basic terms of a welded joint are shown in Figure and the five basic types of joints are shown
Various categories of welded joints (welds) are characterized by symbols that, in general are similar to the shape of welds to be made.
These symbols are categorized as:
- Elementary symbols
- Supplementary symbols
- Combination of elementary and supplementary symbols
- Combination of elementary symbols
Elementary welding symbols
Sl No |
Designation |
Illustration |
Symbol |
1 |
Butt weld between plates with raised edges (the raised edges being melted down completely) |
|
|
2 |
Square butt weld |
|
|
3 |
Single-V butt weld |
|
|
4 |
Single-bevel butt weld |
|
|
5 |
Single-V butt weld with broad root face |
|
|
6 |
Single-bevel butt weld with broad root face |
|
|
7 |
Single-U butt weld (parallel or sloping sides) |
|
|
8 |
Single-U butt weld |
|
|
9 |
Backing run; back or backing weld |
|
|
10 |
Fillet weld |
|
|
11 |
Plug weld; plug or slot weld |
|
12 |
Spot weld |
|
|
13 |
Seam weld |
|
|
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