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Is a weld joint a weak point?

Weakening due to welding is typical with cold-rolled steel. Yes, welding weakens steel, especially in the HAZ (heat-affected zone) if you weld at high temperatures.

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What are the advantages and disadvantages of welded joints over riveted joints?

The welded structure is smooth in appearance, therefore it looks pleasing. The welding joints provide maximum efficiency (even 100% as strong as original material), which is not possible in case of riveted joints. Alterations and additions can be made easily in the existing structures with the welding.

What are the advantages and disadvantages of welding over bolted joints?

The manufacturing process is what determines joint strength: bolted joints offer simplicity, but welded joints provide higher strength. Welded joints are typically stronger than bolted joints, in large part because their material does not have the perforations needed for bolted joints.
What are the assumptions in the analysis of welded joints?
The connected elements are rigid and their deformations are negligible, the welds are homogeneous and isotropic, and only nominal stresses from external loads are taken into account when designing welds.

Three fundamental presumptions are typically made when designing welds: that welds are homogeneous and isotropic; that connected elements are rigid with minimal deformations; and that only nominal stresses from external loads are taken into account.
How are welds so strong?
Welding, on the other hand, eliminates the intermediary and joins the original pieces to each other directly, producing a strong, cohesive bond that is frequently as strong as the material itself.

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