Again, weld strength is not determined by the level of penetration into the base plates. So in the liquid weld puddle, they tend to migrate to the center of the weld where they are the last elements to solidify.
See examples in Figure 1.
The leg size was about 0.
Then the second side is welded. So in the liquid weld puddle, they tend to migrate to the center of the weld where they are the last elements to solidify.
Fillet Weld Leg Sizes Are Meaningless!
Generally no design credit of extra weld strength is given for normal root penetration. The effective area of the weld is calculated by multiplying the length by the throat theoretical throat.
Weld Fusion vs. Weld Penetration
You can now more easily see the drastic difference in the dimension of the actual throat which determines the strength of the weld and the theoretical throat.
That is because a problem can arise if you have a lack of fusion in any part of the joint. This high concentration of softer elements in the center of the weld bead often leads to centerline cracking from the solidification shrinkage stresses of the weld.