Melt through vs partial penetration










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Theoretically but not realistically , you could even have complete fusion to just the depth of a few molecules and still have welded the pieces together. A deeper and broader penetration profile covers a bigger area. However, if the weld is significantly deeper than wide, then the shrinkage stresses are unequal and the weld will crack in the center of the bead as a result. 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. For fillet welds with a flat face and even leg sizes, the distance from the weld face to the root is called the theoretical throat. The appropriate weld size needed to achieve adequate weld strength is determined by the design engineer during the design stage. It does not matter if you have deep penetration or shallow penetration.

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Generally no design credit of extra weld strength is given for normal root penetration. If you achieve fusion beyond the root, then the actual or effective throat length increases see Figure 3 for identification of the theoretical and actual throats. Weld with Shallow Penetration. The deepest possible weld penetration is always best. Many design specifications will also have lower allowable stresses for a fillet weld compared with a butt weld and this can have a significant effect on cost, particularly when designing to match the strength of thicker plates. Additionally, in the case of hardfacing or overlay applications, deeper penetration may dilute the weld deposit chemistry and potentially decrease its resulting wear resistance properties. However, if significant and consistent root penetration can be achieved, which significantly increases the effective throat depth, then the fillet leg size can be reduced without sacrificing weld strength see example in Figure 7.

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This can possibly add additional elements into the weld puddle that makes the weld more crack sensitive. If a high quality root bead is required and access is not available to the root side of the weld e. The smaller the included angle, the less access this will give to the root and the greater is the risk of defects such as lack of side wall fusion. Area of weld in a mm2. and b mm2.

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Description: If you have shallow penetration, the weld is weaker. Smaller fillet welds decrease the amount of weld metal needed, and may even allow for increased travel speeds. Deep penetration can be troublesome when burn through is a concern. Many design specifications will also have lower allowable stresses for a fillet weld compared with a butt weld and this can have a significant effect on cost, particularly when designing to match the strength of thicker plates. Here are three examples.. As the weld metal solidifies, the shrinkage stresses are thus fairly uniform in all directions. Again, weld strength is not determined by the level of penetration into the base plates.
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