comparison of splice joint vs butt welding joint

Comparison of splice joint vs butt welding joint

To compare the strength of a web and flange splice connection versus a full-penetration butt weld joint for an ISMB 200 section according to Indian Standard, we need to consider the design parameters specified in the IS 800: 2007 code.

For the web and flange splice connection, we can assume a splice plate thickness of t = 12 mm, with the splice plate extending to 150 mm beyond the splice location in both directions. The length of the splice plate can be assumed to be 2.5 times the depth of the section (i.e., 500 mm).

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For the full-penetration butt weld joint, we can assume a butt weld length of 150 mm on each side of the joint, and a throat thickness of 8 mm.

Based on these assumptions, we can calculate the strength of each type of joint using the following formula:

Strength of joint = Design strength x Length of joint

where the design strength is calculated as per the IS 800: 2007 code.

For the web and flange splice connection, the design strength can be calculated as follows:

Design strength = 0.9 x fy x t x (150 + 500) / 1000

where fy is the yield strength of the steel, which can be assumed to be 250 MPa.

Plugging in the values, we get:

Design strength = 0.9 x 250 x 12 x 650 / 1000 = 1755 kN

Assuming the length of the splice plate to be 2.5 times the depth of the section, the total length of the splice joint would be:

Length of joint = 2.5 x 200 = 500 mm

Therefore, the strength of the web and flange splice joint would be:

Strength of joint = 1755 kN x 500 mm = 878 kNm

For the full-penetration butt weld joint, the design strength can be calculated as follows:

Design strength = 0.7 x fu x 8 x 150 / 1000

where fu is the ultimate tensile strength of the steel, which can be assumed to be 410 MPa.

Plugging in the values, we get:

Design strength = 0.7 x 410 x 8 x 150 / 1000 = 344 kN

Assuming the length of the butt weld to be 150 mm on each side, the total length of the joint would be:

Length of joint = 2 x 150 = 300 mm

Therefore, the strength of the full-penetration butt weld joint would be:

Strength of joint = 344 kN x 300 mm = 103.2 kNm

As we can see, the web and flange splice joint is significantly stronger than the full-penetration butt weld joint for the given section and design parameters. However, it is important to note that the choice of joint type will depend on several factors such as cost, ease of fabrication and installation, and the specific requirements of the project.