Question 1

Is ERW weaker than seamless?

Accepted Answer

Not inherently “weak,” but different standards and tests apply. Use what the drawing specifies; do not improvise.

Question 2

Can I ask for ERW “without seam worry”?

Accepted Answer

You can specify standards and tests; all welded tubes have a seam by definition. If seam presence is unacceptable, you are outside typical ERW scope — escalate to engineering.

Question 3

Does GI affect ERW choice?

Accepted Answer

Galvanizing is a coating on a base tube that may be ERW MS. Specify both process/coating and base dimensions.