Spacer Welding Symbol with examples

In the vast landscape of welding, understanding the language of symbols is integral to achieving successful outcomes. Among the myriad of symbols, the Spacer Weld Symbol is a unique and crucial one that often goes …

Spacer Welding Symbol

In the vast landscape of welding, understanding the language of symbols is integral to achieving successful outcomes. Among the myriad of symbols, the Spacer Weld Symbol is a unique and crucial one that often goes unnoticed. This blog post aims to shed light on the Spacer Weld Symbol, its applications, and its significance in the world of welding.

What Exactly is a Spacer?

First and foremost, let’s clarify what a spacer is in the context of welding. A spacer, as the name suggests, is a temporary device placed in the joint to ensure a specific gap or distance between the workpieces during welding. It’s especially useful in groove welds where maintaining uniform spacing is crucial for achieving sound welds.

Getting to Know the Spacer Weld Symbol

The spacer weld symbol is placed on the reference line in the welding symbol and is used in conjunction with a groove weld symbol. This combination helps to distinguish it from other weld symbols and provides specific instructions for the welder.

The symbol for a modified groove weld includes a rectangle within it to signify the presence of a spacer as shown in below examples. Spacer symbol is placed within the groove weld symbols.

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The type of material and the dimensions for the spacer should be detailed either within the tail of the welding symbol or directly on the associated drawing.

Spacer Welding Symbol with example

Spacers are often utilized in conjunction with double groove welds. In such welds, both the bottom and top are prepared according to their specified angle and depth, with the spacer inserted into the groove’s midpoint. This is represented symbolically by a rectangle interrupting the reference line, nestled between the double groove welds.

If the depth of penetration surpasses the depth of preparation, the weld is designed to extend into the spacer, as depicted in the below example. Specifications for the spacer should be detailed in the tail of the welding symbol. The width of the spacer corresponds to the root opening.

Image: weldingrpos

Unpacking the Importance of the Spacer Weld Symbol

The Spacer Weld Symbol is particularly vital in welding operations where precision is paramount. It effectively communicates the need to maintain a specific gap between the workpieces, which can significantly influence the quality and integrity of the weld.

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For instance, in certain applications, consistent and precise gaps are necessary to ensure uniform penetration and fusion of the weld material. Here, the Spacer Weld Symbol serves as a clear directive to the welder, ensuring the correct setup of the joint before the welding process begins.

Similarly, in automated or robotic welding operations, the Spacer Weld Symbol can play an essential role in programming the equipment to maintain a specific gap between the workpieces.

Wrapping Up

The Spacer Weld Symbol, while seemingly simple, carries significant weight in the world of welding. It serves as a clear instruction to maintain a specific gap, ensuring the weld’s quality and integrity. Understanding this symbol, along with others in the welding language, is essential for any welder, engineer, or technician involved in the fabrication and assembly of welded structures.


Sandeep Kumar is a highly experienced welding professional and author known for his expertise in welding symbols. With certifications including IWE, AWS-CWI, and ASNT NDT Level III.