Symbols in Welding: Field Weld Explained

What does the flag symbol indicate on a welding symbol?

a. shop weld

b. repair weld

c. field weld

d. weld all around

Answer:

In the context of welding symbols, the flag symbol signifies a field weld, which means the welding operation is to be done in the field or on-site. So, the correct answer is: c. field weld.

Explanation:

In welding blueprints and plans, symbols are utilised to specify detailed and specific instructions. When it comes to a welding symbol, the flag symbol is used to indicate a field weld. This means that the welding operation is to be carried out in the field, or on-site, as opposed to being performed in a shop or factory.

Shop Weld (Option a): A shop weld is one that is performed in a controlled environment, typically in a manufacturing facility or workshop. It's done before the components or parts are transported to the construction site.

Repair Weld (Option b): A repair weld is used to indicate that a weld is necessary to fix a defect or imperfection in the material, often due to damage or an initial welding issue.

Field Weld (Option c): The flag symbol indicates that the weld should be done in the field, at the construction site. This is common when assembling large structures, such as buildings, bridges, pipelines, or other infrastructure, where it is not feasible to perform all the welding in a factory.

Weld All Around (Option d): Weld all around, often indicated by a circle on the welding symbol. The specifies that the weld should encompass the entire circumference of a joint, as opposed to just specific parts of the joint.

So, when you see the flag symbol on a welding symbol, it's telling you that a particular weld or welding operation is to be carried out at the construction site or in the field where the final assembly or construction is taking place.