Why is filler material necessary when welding A358 electrofusion welded pipes?
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Steel pipes specified in the ASTM A358 standard are divided into 5 grades. With the exception of the two special cases in Class 4 where filler material is not required, filler material must be used in the welding process for all other grades. If anyone is familiar with this topic, please help answer my question: 1. Why is filler material necessary? 2. What is the impact of using or not using filler material on the properties of the weld? This post was last edited by zfa808 on 2009-2-16 16:08.]
I have the same question and am eager for experts to give some guidance.
It’s the American material standards, but unfortunately it’s in English. Are you referring to electric fusion welded pipes? The common major categories of welding methods are fusion welding, pressure welding, and brazing. A common method that does not require filler material is butt welding (a type of pressure welding), but it requires corresponding equipment. Companies need to consider costs, compare production volumes and manufacturing processes to decide whether such equipment is necessary, or else outsource the task to other entities. In common pipe welding, whether it is gas metal arc welding or manual welding, filler materials are used (such as wire, flux, electrodes, etc.). Without these filler materials, welding cannot be carried out. Not to mention the properties of the welds. It’s just my humble opinion, meant to stimulate further discussion
It is indeed a problem. For stainless steel welded pipes used in American standards, A312 and A358 are generally employed; A312 does not require the use of filler wire, whereas A358 does. Often, customers use A312 for large-diameter steel pipes such as 1524mm*16; there should be no added wires – how is that possible?
This post was last edited by ztj1118 on 2015-8-15 07:53. Welding wire is generally required; for large welded pipes, automatic welding can be used as well as manual welding. Most stainless steel welded pipes exported use the ASTM A312 standard. I can manufacture large stainless steel welded pipes – they offer excellent quality at a reasonable price. Stainless steel welded pipes