Seam weld classification: Is a seam weld categorized as an arc/gas welding method, or is it actually a resistance welding process using rotating wheel electrodes?

Introduction / Context:
Correctly identifying welding processes is essential for selecting equipment, setting parameters, and specifying inspection criteria. Seam welding is common in sheet fabrication, tube mills, and leak-tight joints.

Given Data / Assumptions:

• Seam welding forms a continuous weld by moving overlapping workpieces between rotating wheel electrodes.
• It uses electrical resistance heating plus force, not an open arc or gas flame.
• Arc and gas welding include processes like SMAW, GMAW, GTAW, and oxy-fuel.

Concept / Approach:
Process names in resistance welding reflect electrode configuration (spot, seam, projection). The energy source is Joule heating at the faying surfaces under pressure. Therefore, calling a seam weld an arc/gas process is incorrect.

Step-by-Step Solution:

Verification / Alternative check:
Review standard process classifications: seam welding resides under resistance welding alongside spot and projection welds.

Why Other Options Are Wrong:

Common Pitfalls:
Assuming continuous-looking welds must be arc-based; ignoring the need for wheel electrode maintenance and current schedules.

Final Answer:
Incorrect