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 No hedging, no outdated editions.
Most welding Q&A on the web cites outdated editions. Table values change between editions — preheat categories get reorganized, fillet weld footnotes revised, acceptance criteria updated. Every answer here references the current edition of each standard, verified against the source.
Each question links to the relevant Clause5 calculator or reference page so you can look up your specific steel, process, and thickness after reading the explanation.
What Preheat Temperature Does A36 Need?
The answer depends on your welding process and material thickness. Table 5.11 gives different values for non-low-hydrogen SMAW vs GMAW/FCAW/SAW.
E7018 vs E6013: When to Use Each Electrode
One is low-hydrogen, one is rutile. The difference changes your D1.1 preheat category, your acceptance criteria, and whether the joint is code-qualified.
What Is Weld Porosity and When Does D1.1 Reject It?
Every weld has some porosity. D1.1 Clause 8 defines exactly how much is acceptable — with different limits for visual inspection vs radiographic testing.
D1.1 Minimum Fillet Weld Size: Table 7.7 Explained
Table 7.7 sets the minimum fillet weld leg size based on the thicker part joined. The footnotes cover low-hydrogen distinctions most references skip.
What Is Carbon Equivalent 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 Strength: When Does Each Govern?
D1.1 Eq. 4-7 fillet weld capacity vs SAE J429 bolt tensile strength. Side-by-side comparison with the 0.707 throat factor explained.
Verified against D1.1:2025 (current edition). For educational purposes. Verify against the applicable code edition.
Related Reference