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rohitmishra051286
Please help me on welding symbols
Welcome to the Cove. 
What sort of help do you need? Welding Symbols is a good place to start, but if you need information regarding a specific application, let us know.
What sort of help do you need? Welding Symbols is a good place to start, but if you need information regarding a specific application, let us know.
If you are following the British Standard (BS EN 22553), check this.
R
Rickser
In the US - American Welding Society. They give a complete set of standards and symbols.
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Darrell B
See AWS A2.4:2012 Standard Symbols for Welding, Brazing, and Nondestructive Examination.