Puddle Welding Definition

: A typical puddle weld is roughly 3/4 inch (19 mm) in diameter .

The puddle welding process involves the following steps:

The primary use of puddle welding is securing steel decking to floor and roof trusses. It provides a fast, permanent connection that can withstand high shear loads.

The welder applies the arc to the top sheet, creating a molten "puddle" that penetrates and bonds with the heavier steel framing (like beams or joists) underneath. puddle welding definition

While the term "puddle" often refers to the molten pool created during any standard welding process, in a structural context, a puddle weld is a specific type of joint used extensively in construction and industrial fabrication. Puddle Weld vs. Plug Weld

Puddle welding is a type of welding that uses a thermit reaction to produce heat. The thermit reaction is a chemical reaction between a metal oxide and a reducing agent, typically aluminum powder, which releases a large amount of heat. This heat is used to melt the metal and form a weld.

Puddle welding offers several advantages, including: : A typical puddle weld is roughly 3/4

: Requires a hole to be pre-punched or drilled in the top sheet before welding begins.

: While often called a "puddle weld" in the trade, industry codes like AWS D1.3 and AISI S100 refer to it as an arc spot weld to more accurately reflect the process. Puddle Weld vs. Plug Weld Though similar, they differ in preparation:

: It is used extensively in construction for anchoring floor and roof panels to structural steel framing. The welder applies the arc to the top

Unlike a continuous bead weld, puddle welding relies on discrete, carefully controlled molten pools to control heat input and minimize warpage. It is sometimes considered a variant of plug welding or spot welding (but using an arc rather than resistance welding).

On very thin decking, a "weld washer" (a small metal disc with a hole) may be used to provide extra mass and prevent the arc from blowing a hole through the sheet before it can fuse to the beam.