80 Standards · Expert Answers
Welding Questions
Every answer cites specific tables and clauses from the current edition. 80 standards covered — D1.1, D1.5, D1.4, ASME IX, API 1104, CSA W59, and more. No hedging, no outdated editions.
Most 용접 Q&A on the web cites outdated editions. 표 values change between editions — 예열 categories get reorganized, 필릿 용접 footnotes revised, 합격 기준 criteria updated. Every answer here references the current edition of each 표준, verified against the source.
Each question links to the relevant Clause5 계산기 or reference page so you can look up your specific steel, process, and 두께 after reading the explanation.
What 예열 온도 Does A36 Need?
The answer depends on your 용접 공정 and material thickness. Table 5.11 gives different values for 비저수소 SMAW vs GMAW/FCAW/SAW.
E7018 vs E6013: When to Use Each Electrode
One is 저수소, one is rutile. The difference changes your D1.1 preheat 범주, your acceptance criteria, and whether the joint is 코드-qualified.
What Is 용접 기공 and When Does D1.1 Reject It?
Every weld has some porosity. D1.1 조항 8 defines exactly how much is acceptable — with different 한계 for 육안 검사 vs 방사선 시험.
D1.1 최소 필릿 용접 크기: Table 7.7 Explained
Table 7.7 sets the minimum fillet weld leg 크기 based on the thicker part joined. The footnotes cover low-hydrogen distinctions most references skip.
What Is 탄소 당량 and Why Does It Matter?
Carbon equivalent predicts cracking risk. D1.1 Annex B uses CE(IIW) and Pcm to determine preheat as an alternative to Table 5.11.
Weld vs Bolt 강도: When Does Each Govern?
D1.1 Eq. 4-7 fillet weld capacity vs SAE J429 bolt tensile strength. Side-by-side 비교 with the 0.707 throat factor 설명.
Verified against D1.1:2025 (current edition). For educational purposes. 확인 against the applicable code edition.
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