Slag deposit in SAW welding

[Dharma dattu]

Hello All,

We have a job with 30 degree single bevel corner joint, as per client requirement we are using SAW process to complete on time schedule.

the fact is for root run the slag is not easy to be removed, as its hard and taking a lot of time even for grinding wheel / chipping. can some one say the reason for it. or a solution. 

Subsequent layers  slag is releasing on it's own, so i don't doubt filler metal or flux.

we are at present using base metal 20mm thk and 4mm filler metal, brand, D&H.

Regards,

Dharma Dattu. B

[Kannayeram Gnanapandithan]

This is due to joint design, deeper / narrow the joint difficult to remove slag

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[Dharma dattu]

Sir,

I is there any solution as for welding it takes 1 hour, for clearing slag it's taking more than 3 hours.

Regards,

Dharma Dattu. B

On Monday, 16 December 2019 11:26:50 UTC+5:30, kannayeram gnanapandithan wrote:

This is due to joint design, deeper / narrow the joint difficult to remove slag

On Mon, 16 Dec 2019 8:39 am Dharma dattu, <dharm...@gmail.com> wrote:

Hello All,

We have a job with 30 degree single bevel corner joint, as per client requirement we are using SAW process to complete on time schedule.

the fact is for root run the slag is not easy to be removed, as its hard and taking a lot of time even for grinding wheel / chipping. can some one say the reason for it. or a solution. 

Subsequent layers  slag is releasing on it's own, so i don't doubt filler metal or flux.

we are at present using base metal 20mm thk and 4mm filler metal, brand, D&H.

Regards,

Dharma Dattu. B

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https://materials-welding.blogspot.com/
https://www.linkedin.com/groups/122787
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[Kannayeram Gnanapandithan]

pl check any possibility of root by solid wire and further by saw

THANKS & BEST REGARDS,

KG.PANDITHAN, BE, IWE,  CSWIP 3.1,

ISO 9712 Level 2 in VT,

ASNT-Level II in PT,MT,RT & UT,

LA ISO 9001-2015,

International Welding Engineer. 

CONSULTANT-WELDING & QUALITY

Mobile no: +919940739349

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[Devalkumar Desai]

You can use GTAW for root run and then continue with SAW for remaining welding

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[Amitabh Bhattacharya]

Hi Dharma,

Problem experienced  is typical to narrow V-groove SAW process. You haven't indicated base material in your mail. .

For SS/DSS base material ,SAW slag removal after root run is extremely difficult even with C-Steel.  

Following are suggestions for improvement:  

1) Joint design may be changed to U- groove with radius -use 6mm radius ball end mill.

2) Re-dry flux  250 deg F/2-3hrs on drying tray spead evenly even for new bag.

3) Root run by other process ( e.g GTAW) as suggested.

Hope this helps ...

Regards

Amitabh .

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