Welding Rebars - Structural engineering general discussion | Eng-Tips

05 Jun.,2025

 

Welding Rebars - Structural engineering general discussion | Eng-Tips

When welding rebar to structural steel, the provisions of both AWS D1.1 and D1.4 have to be satisfied.[Ref: D1.4 1.2.1]

Make sure welders are qualified per D1.1 and D1.4 for the positions, processes, etc

Check D1.1 Table 3.1 and D1.4 Table 5.1 for filler metal selection. Make sure you read also D1.1 Table 2.3 and Sec 3.3 and D1.4 Table 2.1 and Sec 5.1.2

For preheat, D1.1 Table 3.2 and D1.4 Table 5.2, the higher value will govern. For the rebar try and switch to low alloy A706 steel as it has better weldability properties. If you stick with A615 you'll need the CE and if it is not available you'll have to use a preheat of no less than 500 degrees F, which is certainly higher than all the preheat values in D1.1 table 3.2

Two questions for you.

What type of steel are the HP piles to be fabricated from?

Do you already have a WPS submital backed up with a POR from the fabricator/contractor?



As I understand it, normal rebar has a fairly high carbon content and isn't really intended for welding. There IS low-alloy rebar that is better suited for welding, check into it. ASTM A706, maybe? Not sure about the number.

I'm not that familiar with them, but they do make mechanical splicing devices- I wonder if they make something you can weld to the piling then clamp the bars in it? Or alternatively, use the more-weldable rebar, stub it up and splice to the 615 rebar.

Dimensions and Properties of #10 reinforcing steel - Calcs.app

  • What grade is #10 rebar?

    #10 rebar is available in multiple grades, as noted by the grade line or grade marking on the bar. In the US, common grades include 60ksi and 75ksi for bar produced to ASTM A615, and grade 60ksi and 80ksi for ASTM A706. In Canada, common grades include 400 and 500 for bar produced to CSA G30.18. Higher and lower strengths are available for special applications, as well as bar produced under different steel standards and compositions.

    If you want to learn more, please visit our website Xingtai Steel.

  • Is #10 bar weldable?

    The weldability of #10 rebar depends on its grade and chemical composition. All steel rebar can be welded, but some types are more suitable than others for welding. Rebar marked with a "W" has a composition that is more readily weldable. This marking indicates the rebar meets ASTM A706 specifications in the US, or Weldable specifications for G30.18 in Canada, which control the chemical composition to ensure weldability. Weldable rebar has lower carbon equivalent, controlled carbon and manganese content, requirements for other elements like phosphorus and sulfur. Standard (non-weldable) rebar steel is generally not recommended for welding because its chemical composition hasn't been controlled for welding. It may have high carbon content that could lead to cracking, and the mechanical properties could be compromised by welding.

    If you need to weld #10 rebar, you should: Verify it's a weldable steel type with the "W" marking, use qualified welding procedures (AWS D1.4), have certified welders perform the work, consider preheating, and get engineer approval before welding structural rebar. For critical structural applications where welding is needed, it's best to specifically order Weldable rebar rather than trying to weld standard rebar.

  • How much does #10 rebar weigh?

    #10 rebar weighs approximately 4.3 lb/ft ( 6.4 kg/m ).

    If you are looking for more details, kindly visit astm a615 rebar.

  • What are the typical applications for #10 rebar?

    #10 rebar is commonly used in concrete construction projects like slabs, foundations, columns, walls, and other structural elements that require structural reinforcement.

  • What is the required lap splice for #10 rebar?

    See the Development Length tool to calculate development lengths for #10 rebar.

  • What is the standard length of #10 rebar?

    #10 rebar typically comes in 20, 30, 40, or 60-foot lengths, and custom lengths can be ordered from the supplier. If longer lengths are required, the rebar is usually extended with a tension lap splice or mechanical coupler.

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