Per D1.1:2025 Table 7.7, minimum Köşe Kaynağı Boyut depends on the thinner part for Düşük Hidrojen processes and the thicker part for Düşük Hidrojen Olmayan processes. The four minimums are 1/8 in, 3/16 in, 1/4 in, and 5/16 in by governing Kalınlık range.
Built on AWS D1.1:2025 Table 7.7 — every minimum traced to the Madde.
Thickness of Part Joined (T)
Minimum Fillet Weld Size
T ≤ 1/4 in [T ≤ 6 mm]
1/8 in [3 mm]
1/4 in < T ≤ 1/2 in [6 mm < T ≤ 12 mm]
3/16 in [5 mm]
1/2 in < T ≤ 3/4 in [12 mm < T ≤ 20 mm]
1/4 in [6 mm]
3/4 in < T [20 mm < T]
5/16 in [8 mm]
Source: D1.1:2025 Table 7.7 — Note (a): for non-low-H processes without Clause 6.8.4 Ön Isıtma, size governs by thicker part and single pass is required. Note (b): weld size need not exceed thickness of thinner part. Note (c): for cyclically loaded structures, 3/16 in [5 mm] is the minimum floor; thicker Table 7.7 rows still govern when larger.
Hangi Kalınlık'ın geçerli olduğu, Kaynak Prosesi'nize ve Ön Isıtma prosedürünüze bağlıdır — D1.1:2025 Tablo 7.7 dipnot (a). Clause 6.8.4 = sadece Ön Isıtma kullanmak değil, nitelikli bir Ön Isıtma prosedürü.
Reference tool only. Doğrula against your WPS, contract documents, and the governing D1.1 edition before fabrication or Muayene Kabul.
Filler metal selection is an essential variable per ASME Section IXQW-404 — changing to a different F-Number or A-Number classification requires procedure requalification.
Required fillet weld volume also drives shop productivity — the weld deposition rate for your wire and parameters tells you how many pounds of Kaynak Metali you can lay per hour, which sets the labor cost per joint.
Per AWS A2.4 §8.2.1, the leg size determined here is the number drawn to the left of the fillet weld symbol on the welder's print — the same dimension the inspector verifies with a fillet weld gauge.
For weld-thermal control during fabrication, the heat input calculator translates your Voltaj, Amper, and Kaynak Hızı into the kJ/in (or kJ/mm) value engineers cite when restricting heat on Q&T steels per D1.1 Clause 7.7.
"Table 7.7 is probably the single most-referenced table on any structural steel shop floor. Every fitter checks it before tacking, every inspector checks it during VT. Getting minimum fillet weld size wrong is the fastest path to a rejection tag."
— Widely cited in CWI exam preparation, reflecting D1.1:2025 Clause 7.13 and Table 7.7 minimum fillet weld size requirements
Common Questions
Sıkça Sorulan Sorular
D1.1'e göre Minimum Köşe Kaynağı Boyutu nedir?
D1.1:2025 Tablo 7.7, dört Minimum Köşe Kaynağı Boyutu eşiğini tanımlar. 1/4 in'e kadar malzeme Kalınlık'ı T, 1/8 in Minimum Köşe Kaynağı gerektirir. 1/4 in'den 1/2 in'e kadar 3/16 in gerektirir. 1/2 in'den 3/4 in'e kadar 1/4 in gerektirir. 3/4 in'den fazla 5/16 in gerektirir. Hangi Kalınlık boyutu T'yi temsil eder, dipnot (a)'ya göre prosesinize bağlıdır: Düşük Hidrojen prosesleri (E7018, SAW, GMAW, FCAW) için T, birleştirilen daha ince parçaya eşittir ve tek paso gerekli değildir. Nitelikli bir 6.8.4 Ön Isıtma prosedürü olmayan Düşük Hidrojen Olmayan prosesler (E6010, E6011) için T, birleştirilen daha kalın parçaya eşittir ve tek paso Kaynak'lar gereklidir. Dipnot (b), Kaynak Boyutu'nun birleştirilen daha ince parçanın Kalınlık'ını aşmak zorunda olmadığını belirtir. Dipnot (c), döngüsel olarak yüklendi yapılar için 3/16 in Minimum Köşe Kaynağı Boyutu belirler.
Köşe Kaynağı Boyutu, daha ince mi yoksa daha kalın plakaya mı bağlıdır?
It depends on your welding process per Table 7.7 footnote (a). For low-hydrogen processes (E7018, GMAW, FCAW, SAW), T equals the thickness of the thinner part joined. For non-low-hydrogen processes (E6010, E6011) without a qualified Clause 6.8.4 preheat procedure, T equals the thickness of the thicker part joined. This distinction matters because governing by the thicker plate produces a larger minimum weld size. Footnote (b) adds a practical cap: the required weld size need not exceed the thickness of the thinner part. For example, if a 1 in plate is fillet-welded to a 3/16 in plate using E6010 without 6.8.4 preheat, Table 7.7 would require a 5/16 in fillet based on the thicker plate, but footnote (b) allows a 3/16 in fillet since the thinner plate is only 3/16 in thick. This prevents overwelding thin members and potential burn-through or distortion.
Tablo 7.7 Minimum'undan daha küçük bir Köşe Kaynağı kullanabilir misiniz?
Generally no — Table 7.7 minimums are mandatory. The only code-permitted reduction is footnote (b), which states the weld size need not exceed the thickness of the thinner part joined. Note that when using non-low-hydrogen processes (E6010, E6011) without a qualified Clause 6.8.4 preheat procedure, the governing thickness is the thicker part and single-pass welds are required per footnote (a) — this typically results in a larger minimum size compared to low-hydrogen processes where the thinner part governs. Using a weld smaller than the applicable minimum is a code violation that would be rejected during visual inspection per Table 8.1 item (6) Undersized Fillet Welds and Clause 8.9. The Engineer may approve alternative sizes through WPS qualification per Clause 6, but this is uncommon for standard fillet welds.
What is the difference between fillet weld leg size and throat size?
Leg size is the distance from the weld root to the toe along either face of the joint. For an equal-leg fillet weld, both legs are the same dimension, and this is the number specified on the welding symbol per A2.4. Throat size is the shortest distance from the root to the face of the weld — for a flat or slightly convex equal-leg fillet at a 90-degree joint angle, the theoretical throat equals leg size multiplied by 0.707. D1.1 Table 7.7 specifies minimum leg size, not throat size. However, effective throat is what carries the load in design calculations per Clause 4.5.2.6. For deep-penetration GMAW or SAW processes, engineers may increase the effective throat beyond the theoretical value using the provisions in Clause 4.5.2.6, which addresses throat calculations for various joint geometries.
Tek paso Köşe Kaynağı ne zaman gereklidir?
Table 7.7 footnote (a) governs when single-pass fillet welds are required. For non-low-hydrogen processes (E6010, E6011) without a qualified Clause 6.8.4 preheat procedure, single-pass welds are mandatory at all thickness ranges — this is not optional. For low-hydrogen processes (E7018, GMAW, FCAW, SAW), the single-pass requirement does not apply, and multi-pass welds are permitted at any size. Footnote (a) makes no reference to welding position — the single-pass requirement applies regardless of whether the weld is in the flat, horizontal, vertical, or overhead position. In practice, single-pass fillets up to about 5/16 in are common in production because they reduce labor time and heat input. For larger fillets, multiple passes are typical to avoid lack of fusion at the root, excessive convexity, and poor toe tie-in — all rejectable conditions under Table 8.1.
AWS D1.1:2025 Tablo 7.7'ye göre: “Minimum Köşe Kaynağı Boyutu, birleştirilen parçaların daha kalın olanı tarafından belirlenir; ancak Kaynak Boyutu, birleştirilen daha ince parçanın Kalınlık'ını aşmak zorunda değildir.”
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