There is no reason no to use GMAW. Numerous examples of successful applications in pipe and pressure applications exists. Modern power sources and software makes the process easy to use.
Welding defects are not caused by the process but by the human operating with the process.
My only concern would be the pipe diameter. Manipulatio of the welding torch is more difficult with smaller diameter pipes.
John du Plessis
Technology Manager
Tel: +27 (11) 298 2100
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From:
Sent: 14 October 2010 06:08 AM
To:
Subject: Re: [MW:7544] GMAW instead of GTAW +SMAW
| Hi, Normally GMAW is not allowed in piping and pressure vessel welding because of the more weld defects even which cannot identify in RT. But With proper application and appropriate parameters, excellent welds can be produced using short-circuit GMAW. However, if the welder is not careful to follow established procedures, a number of serious weld defects can occur. The most significant of these defects is lack of sidewall fusion; the molten puddle of metal does not fully fuse with the pipe sidewalls, and a "cold lap" defect occurs. This is a significant structural defect that is difficult to identify with commonly used nondestructive inspection methods such as radiography. So while the GMAW and FCAW processes have gained popularity for many applications, they have not been considered serious options for most pipe welding operations. This poor reputation is no longer deserved, however. Continuous development in both power supply and consumable technology have made this process a viable alternative to manual GTAW or shielded metal arc welding (SMAW) of pipe. (Karthik) Karthikeyan.S QA/QC Manager Getabec Energy Co.,Ltd. 379,Moo6,Soi8,Nikhomphatana, Rayong-21180, Phone: 0066 38 897035-8 (Off) Fax: 0066 38 897034 Hand Phone: 0066 892512282
Our contractor want to use GMAW process inplace of GTAW+SMAW |
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