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 No hedging, no outdated editions.

Use this question hub when you know the welding problem but not the right reference page yet. It groups common field, inspection, WPS, process, material, and symbol questions so you can move from plain-language wording to a calculator, guide, or standards page.

Common answer anchors include Table 5.11 for preheat, Table 7.7 for fillet size, and Clause 8 for inspection context.

Calculate D1.4 Rebar Preheat →

Most welding Q&A on the web cites outdated editions.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.

Table 5.11Clause 5.7

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.

Table 5.3Table 5.11A5.1

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.

Clause 8Table 8.1

D1.1 Minimum Fillet Weld Size: Table 7.7 Explained

Table 7.7 sets the minimum fillet weld leg size by process-specific governing thickness. The footnotes cover low-hydrogen distinctions most references skip.

Table 7.7Footnotes a/b/c

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.

Annex BTable B.1Clause 5.7

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.

Eq. 4-7Clause 4.7.3Clause 4.8.7

SMAW vs FCAW: What Changes for a WPS?

Process choice affects filler classification, deposition behavior, field setup, and how procedure variables are recorded.

SMAWFCAW

SMAW vs GMAW: Which Process Fits the Job?

Compare stick and wire-feed welding from the perspective of equipment, shielding, productivity, and procedure control.

SMAWGMAW

What Should a Weld Inspection Checklist Include?

A practical sequence for checking drawings, WPS coverage, fit-up, visual acceptance, NDE records, and repair documentation.

VTNDERecords

WPS vs PQR: What Is the Difference?

A WPS tells the welder how to make the weld; a PQR records the test that supports a qualified procedure.

WPSPQR

FAQ

What kinds of welding questions are collected here?

This hub collects practical welding questions about procedures, processes, inspection, symbols, materials, calculators, and common field decisions.

How should I use the question hub?

Start with the question closest to your current job, then follow the related calculator or reference links when you need a specific lookup or deeper explanation.

Are question pages a substitute for project requirements?

No. Question pages are educational references. Project requirements, contract documents, applicable code editions (such as AWS D1.1:2025), and engineering direction still govern production work.

Look Up Your Preheat Requirement →

Verified against D1.1:2025 (current edition). For educational purposes. Verify against the applicable code edition.

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