WPS Creation Series — Post 10 :Technique Variables (QW-410) 编制系列 — 第 10 篇:工艺变量(QW-410)

🔧 WPS Creation Series — Post 10

🔧 WPS 编制系列 — 第 10 篇

🎯 Technique Variables (QW-410)

🎯 工艺变量（QW-410）

📘 Why This Topic Matters

📘 为什么这个主题很重要

Same WPS. Same machine. Same filler.

相同的 WPS。相同的机器。相同的填充金属。

Still getting different weld quality?

仍然得到不同的焊接质量？

👉 The difference is TECHNIQUE

👉 区别就在于工艺

This is where:

正是在这里：

Welder skill meets process control

焊工技能与过程控制相遇

Quality is made or lost in real time

质量在实时操作中形成或丧失

⚙️ What are Technique Variables?

⚙️ 什么是工艺变量？

As per ASME Section IX — QW-410,

根据 ASME 第九卷 — QW-410，

these are how the welding is performed, not just what is used.

这些是关于焊接如何进行的变量，而不仅仅是用什么材料。

WPS should define: • Stringer vs Weave beads

WPS 应定义：• 直线焊道 vs 摆动焊道

• Travel speed

• 焊接速度

• Electrode manipulation

• 焊条/焊枪操作手法

• Arc length control

• 电弧长度控制

• Cleaning between passes

• 焊道间清理

🔍 Key Technique Variables

🔍 关键工艺变量

1️⃣ Bead Type (Stringer vs Weave)

1️⃣ 焊道类型（直线焊道 vs 摆动焊道）

• Stringer Bead

• 直线焊道

✔ Better penetration

✔ 更好的熔深

✔ Lower heat input

✔ 较低的热输入

✔ Preferred in critical piping

✔ 在关键管道中优先使用

• Weave Bead

• 摆动焊道

✔ Wider coverage

✔ 覆盖范围更宽

✔ Used for filling

✔ 用于填充焊道

⚠ Excess weaving = slag inclusion risk

⚠ 过度摆动 = 夹渣风险

2️⃣ Travel Speed

2️⃣ 焊接速度

Controls:

控制：

✔ Heat input

✔ 热输入

✔ Bead shape

✔ 焊道成形

• Too fast → Lack of fusion

• 过快 → 未熔合

• Too slow → Excess penetration / burn-through

• 过慢 → 过量熔透 / 烧穿

3️⃣ Electrode Manipulation

3️⃣ 焊条/焊枪操作手法

Includes: • Angle (lead/drag)

包括：• 角度（前倾/后拖）

• Motion pattern

• 运动模式

👉 Poor manipulation =

👉 操作不当 =

❌ Uneven bead

❌ 焊道不均匀

❌ Undercut

❌ 咬边

❌ Slag entrapment

❌ 夹渣

4️⃣ Arc Length Control

4️⃣ 电弧长度控制

✔ Short arc → stable weld

✔ 短弧 → 稳定的焊缝

❌ Long arc → spatter, porosity

❌ 长弧 → 飞溅、气孔

👉 Critical in GTAW root pass

👉 在 GTAW 根部焊道中至关重要

5️⃣ Interpass Cleaning

5️⃣ 焊道间清理

✔ Remove slag / oxide between passes

✔ 清除焊道间的焊渣/氧化物

❌ Poor cleaning =

❌ 清理不良 =

• Slag inclusion

• 夹渣

• Lack of fusion

• 未熔合

⚠️ Variable Classification

⚠️ 变量分类

👉 Most technique variables are:

👉 大多数工艺变量属于：

🟡 Non-Essential Variables

🟡 非重要变量

✔ Change allowed without requalification

✔ 允许变更而无需重新评定

❌ But directly affects weld quality

❌ 但直接影响焊接质量

❌ Common Site Mistakes

❌ 常见的现场错误

❌ Excessive weaving in root pass

❌ 根部焊道过度摆动

❌ Inconsistent travel speed

❌ 焊接速度不一致

❌ Long arc during welding

❌ 焊接时电弧过长

❌ No cleaning between passes

❌ 焊道间未清理

👉 Leads to: • Slag inclusion

👉 导致：• 夹渣

• Porosity

• 气孔

• Poor bead profile

• 焊道成形不良

• Repair work

• 返修工作

🧪 QA/QC Reality Check

🧪 QA/QC 现实核查

You can’t see technique in documents — only in weld results

你无法在文件中看到工艺——只能在焊缝结果中看到

✔ Monitor welder during welding

✔ 在焊接过程中监督焊工

✔ Check bead profile visually

✔ 目视检查焊道成形

✔ Verify cleaning practice

✔ 确认清理做法

✔ Compare with WPS guidelines

✔ 与 WPS 指南进行比对

🧠 Field Insight

🧠 现场洞察

In refinery piping:

在炼油厂管道中：

👉 Root pass success depends on: • Arc control

👉 根部焊道的成功取决于：• 电弧控制

• Travel speed

• 焊接速度

• Hand stability

• 手部稳定性

Not just qualification

而不仅仅是资格评定

📌 Engineering Insight

📌 工程洞察

Technique is not “welder style” —

工艺不是“焊工风格”——

It is a controlled variable defined by WPS

它是一个由 WPS 定义的可控变量

✅ Golden Rule

✅ 黄金法则

Good technique = Defect-free weld

良好的工艺 = 无缺陷焊缝

📐 Welding quality is created during execution, not inspection.

📐 焊接质量是在执行过程中创造的，而不是在检验中。

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