Weld Symbols – Understanding the basics

If you work within the construction industry – and steel construction in particular – you should be familiar with Weld symbols and their meanings. Weld symbols are used in structural drawings to show where the welds are to be placed and may also show the size, type of weld, number of welds, details about the weld and even details about the joint. In short they convey a LOT of information, and it is essential to convey this information accurately – which makes understanding Weld symbols vital.

First steps to getting your head around welds is to break down the Weld symbol itself:

Weld symbol_breakdown


1. FIELD WELD – When a ‘flag’ symbol is shown where the leader line joins the reference line, this is called a Field Weld and means the weld will be done in another location, ie. on site

2. WELD ALL AROUND – When a circle is placed where the leader line connects with the reference line, this indicates the weld is All Around. This means the weld extends all the way around the joint the arrow is pointing…

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