Lack of fusion: base metal not melted. Why? Because base metal temperature did not achieve 1510 degC. Why? Because heat input not adequate (forget high or low). You may use a high heat input welding method (per definition) and you may still get lack of fusion. With GMAW it happens mainly because the welder "runs" too fast in order to achieve high productivity rates. You do not wonder why many EPC specs do not allow GMAW either for pressure equipment or for critical structural steel?
Best regards
Dr Georgios Dilintas
Authorized Nuclear Inspector
Authorized Inspector Supervisor
HBS Regional Technical Manager
From: Kannayeram Gnanapandithan [kgpandithan@gmail.com]
Sent: 07/30/2014 09:15 AM ZE5B
To: materials-welding <materials-welding@googlegroups.com>
Subject: Re: [MW:21489] WPS of SS 304L
...and you get frequently luck of fusion
Best regards
Dr Georgios Dilintas
Authorized Nuclear Inspector
Authorized Inspector Supervisor
HBS Regional Technical ManagerFrom: Kannayeram Gnanapandithan [kgpandithan@gmail.com]
Sent: 07/29/2014 02:07 PM ZE5B
To: materials-welding <materials-welding@googlegroups.com>
Subject: Re: [MW:21487] WPS of SS 304Lvoltage depends on Arc length , manual welding ( constant current), it varies with welder to welder and u can preset the voltage before start welding but u can set amps,, but in GMAW, u can preset voltage and separately and Arc length will be always constant because it is Constant Voltage/Potential Power source--THANKS & BEST REGARDSKG.PANDITHAN, AWS-CWI, CSWIP 3.1CONSULTANT-WELDING & QUALITYOn Tue, Jul 29, 2014 at 1:46 PM, <george.dilintas@gr.bureauveritas.com> wrote:In GTAW the arc is 10 to 15 Volt. In the other processes the arc is much higher. In GMAW a very skilled welder may achieve 20 Volts. The Amps depend on the diameter of the rod and the speed on the ability of the welder who in this process has a very good control of the pool which crucial for the heat input. The overall efficiency may be low but if the lost energy is not dissipated in the weld pool it is not contributing to the heat input in the weld
Best regards
Dr Georgios Dilintas
Authorized Nuclear Inspector
Authorized Inspector Supervisor
HBS Regional Technical ManagerFrom: Mohit Aggarwal [aggarwalmohit05@gmail.com]
Sent: 07/27/2014 09:16 PM ZE5B
To: materials-welding <materials-welding@googlegroups.com>
Subject: Re: [MW:21481] WPS of SS 304LDear Sir,
How GTAW is lower heat input process in which small dia. Wire use high current with low speed!!
Please clarrify my doubt.Best Regards,
Mohit Aggarwal.On 27-Jul-2014 2:27 PM, <george.dilintas@gr.bureauveritas.com> wrote:--GTAW is a low heat input process
Best regards
Dr Georgios Dilintas
Authorized Nuclear Inspector
Authorized Inspector Supervisor
HBS Regional Technical ManagerFrom: Mohit Aggarwal [aggarwalmohit05@gmail.com]
Sent: 07/27/2014 12:14 PM ZE5B
To: materials-welding <materials-welding@googlegroups.com>
Subject: Re: [MW:21469] WPS of SS 304LYou can do per as good engineering practice this can lead to problem in weld after welding with GTAW on SMAW pass due to high heat input in GTAW..
Best Regards,
Mohit Aggarwal.On 27-Jul-2014 6:52 AM, "harenath jha" <harenathjha@gmail.com> wrote:--Hello Expert,--
I am having a wps which is done with GTAW (Root)+ SMAW (Fill-up and final),
Can we weld a joint in the following sequence
Root with GTAW , Fill-up with SMAW and final pass or capping with GTAW ?
Is there any code supporting details ?
plate thick. 32 mm & dia approx 6 meter
Regards
Aakash
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