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 No hedging, no outdated editions.

Most 溶接 Q&A on the web cites outdated editions. 表 values change between editions — 予熱 categories get reorganized, すみ肉溶接 footnotes revised, 受入基準 updated. Every answer here references the current edition of each 規格, verified against the source.

Each question links to the relevant Clause5 計算機 or reference page so you can look up your specific steel, process, and 板厚 after reading the explanation.

What 予熱温度 Does A36 Need?

The answer depends on your 溶接工程 and material thickness. Table 5.11 gives different values for 非低水素 SMAW vs GMAW/FCAW/SAW.

Table 5.11Clause 5.7

E7018 vs E6013: When to Use Each Electrode

One is 低水素, one is rutile. The difference changes your D1.1 preheat カテゴリー, your 合否基準 criteria, and whether the joint is 基準-qualified.

Table 5.3Table 5.11A5.1

What Is 溶接気孔 and When Does D1.1 Reject It?

Every weld has some porosity. D1.1 条項 8 defines exactly how much is acceptable — with different 限界値 for 外観検査 vs 放射線透過試験.

Clause 8Table 8.1

D1.1 最小すみ肉溶接サイズ: Table 7.7 Explained

Table 7.7 sets the minimum すみ肉溶接の脚長サイズ based on the thicker part joined. The footnotes cover low-hydrogen distinctions most references skip.

Table 7.7Footnotes a/b/c