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Use Undermatching Weld Metal Where Advantageous

Escrito por Leandro Peres Ferreira. Posted in Processos de Soldagem

Practical Ideas for the Design Professional by Duane K. Miller, P.E.

How Strong Does a Weld Have To Be?

The answer is fairly simple: strong enough to transfer the loads that are passed between the two interconnected materials. How strong does the weld metal have to be? The answer to that question is far more complex.

In order to make a weld of sufficient size, the designer has three variables that can be changed to affect the weld strength:

• weld length;

• weld throat, and;

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Consider Direction of Loading When Sizing Fillet Welds

Escrito por Leandro Peres Ferreira. Posted in Processos de Soldagem

Practical Ideas for the Design Professional by Duane K. Miller, Sc.D., P.E.

The traditional approach used to design a fillet weld assumes that the load is resisted by the weld’s throat, regardless of the direction of loading. Experience and experimentation, however, have shown that fillet welds loaded perpendicular to their longitudinal axis have an ultimate strength that is approximately 50% greater than the same weld loaded parallel to the longitudinal axis. The traditional approach, in which direction of loading is not considered, is therefore conservative. Such a philosophy was incorporated into the AWS D1.1 Structural Welding Code - Steel, as represented by the following provision from the 1994 edition.

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Fillet Welds That Are “Too Long”

Escrito por Leandro Peres Ferreira. Posted in Processos de Soldagem

Practical Ideas for the Design Professional by Duane K. Miller, Sc.D., P.E.

When fillet welds exceed a certain leg size to length ratio, and when such welds are “end loaded,” they can become “too long.” That is, the added length may not add strength that is proportional to the increase in length. This situation rarely occurs, as will be seen, but the designer should be aware of when it occurs, why the capacity is diminished, and how to mitigate the effects.

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Consider Penetration When Determining Fillet Weld Size

Escrito por Leandro Peres Ferreira. Posted in Processos de Soldagem

Practical Ideas for the Design Professional by Duane K. Miller, Sc.D., P.E.

Introduction A flat-faced, equal-legged fillet weld in a 90° T-joint has a theoretical throat dimension of 0.707 ω, where ω is the leg size (Figure 1). This assumes fusion is achieved to the root of the joint, but not necessarily beyond that point.