80 Standards · Expert Answers

Welding Questions

全ての回答は、現行版の特定の表と条項を引用しております。D1.1、D1.5、D1.4、ASME IX、API 1104、CSA W59など、80の規格を網羅しております。曖昧な表現や古い版の引用はございません。

Use this question hub when you know the 溶接 problem but not the right reference page yet. It groups common field, 検査, WPS, process, material, and symbol questions so you can move from plain-language wording to a 計算機, ガイド, or standards page.

Common answer anchors include Table 5.11 for 予熱, Table 7.7 for fillet サイズ, and Clause 8 for inspection context.

ウェブ上のほとんどの溶接に関するQ&Aは、古い版を引用しております。表の値は版によって変更され—予熱のカテゴリが再編成されたり、すみ肉溶接の脚注が改訂されたり、受入基準が更新されたりします。こちらの全ての回答は、各規格の現行版を参照し、原典と照合して確認しております。

各質問は、関連するClause5計算機または参照ページにリンクしており、説明をお読みいただいた後、お客様の特定の鋼材、プロセス、板厚を検索いただけます。

What 予熱温度 Does A36 Need?
The answer depends on your 溶接工程 and material 板厚. 表 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 受入基準, 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 size by process-specific governing thickness. The footnotes cover low-hydrogen distinctions most references skip.
Table 7.7Footnotes a/b/c
What Is 炭素当量 and Why Does It Matter?
Carbon equivalent predicts cracking risk. D1.1 附属書 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 強度: When Does Each Govern?
D1.1 Eq. 4-7 すみ肉溶接 capacity vs SAE J429 bolt 引張強さ. Side-by-side 比較 with the 0.707 throat factor 解説.
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 溶接検査 チェックリスト Include?
A practical sequence for checking drawings, WPS coverage, 組立 (フィットアップ), 外観合格, NDE records, and 補修 documentation.
VTNDERecords
WPS vs PQR: What Is the Difference?
A WPS tells the 溶接士 how to make the weld; a PQR records the test that supports a qualified procedure.
WPSPQR
What kinds of 溶接Q&A 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 要求事項?

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.

D1.1:2025(現行版)と照合し確認済みです。教育目的でご利用ください。適用される基準の版と照合して確認してください。