Fillet Weld Throat
Calculate the effective throat of a fillet weld, a = 0.707 × z, from the leg z of the fillet. For an equal-leg fillet, the throat — the smallest dimension of the resisting section, from root to face — equals the leg times sin(45°) ≈ 0.707. The result, in the same unit as the leg (mm), is the dimension used to calculate the strength of the welded joint, since the weld tends to fail across this minimum section. Sizing the throat correctly ensures the weld carries the design load. Enter the fillet leg.
Resultado
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Garganta de filete de solda
Um filete de solda (solda em ângulo, que une duas peças em T ou em sobreposição) tem seção transversal aproximadamente triangular. Suas dimensões nominais são as pernas (catetos) z, mas a peça não rompe ao longo de uma perna — ela rompe pela menor seção resistente, chamada garganta efetiva (a), medida da raiz da solda até a face, perpendicular à hipotenusa. Para um filete de pernas iguais, a geometria do triângulo retângulo dá a = z × sen(45°) = 0,707 × z. É essa garganta, e não a perna, que entra no cálculo de resistência: a tensão na solda é a carga dividida pela área da garganta (a × comprimento do cordão). Subestimar isso — calcular como se a seção fosse a perna inteira — superdimensionaria a resistência e seria inseguro. Na prática, especifica-se a perna z no desenho (é o que o soldador consegue medir e controlar), e o projetista converte para a garganta para verificar se a junta suporta o esforço de projeto, aplicando ainda os coeficientes de segurança da norma. Para filetes de pernas desiguais, usa-se a menor garganta possível inscrita no triângulo. Informe a perna do filete.
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