Welding qualification for aluminium 6061 materials 5

[privaate]

thread725-355292
Hi
This is PVKRaju
I am also new for welding and I would like to know the welding qualification as per ASME SEC IX for aluminium 6061 material
Please suggest
Thanks in advance
Regards
PVKRaju

 

[gtaw]

I look at it this way, if we can offer some useful advice or cautionary advice, we've provided a service. If the reader realizes they don't have the necessary back ground to proceed without getting professional help, then we've provided a useful service to both the person seeking advice and the general public.

In this case, the advice given has been that the are special considerations that need to be taken into account when working with aluminum and its alloys. Aluminum isn't carbon steel and it requires a different approach when designing, fabricating,and welding. The designer needs to recognize aluminum's properties can be adversely affected when it is welded. The fabricator has to recognize that his approach to welding aluminum has to be different than the techniques typically used to weld carbon steel. Aluminum shouldn't be preheated and the interpass temperature must be limited to mitigate the probability of overaging the base metal. Cleaning is essential to successful welding. Groove angles must be more generous than those used with steel. Grinding disks and abrasives should not employ aluminum oxide grit, after all, aluminum oxide is something that should be removed before welding. Waxes, often applies to grind and sanding disks, should be avoided since they contaminate the aluminum surface and promote porosity in the weld if it isn't completely removed prior to welding. There are other considerations, but if the poster is at least made aware of some of these issues, we are accomplishing a worth goal.

Best regards - Al

 

[privaate]

Recently we have done welding process for aluminium 6061 T6 material fillet welding base plate 12mm thick with 40mm rod with proper wps and maintenand process parameter
But it was failed during macro test due to not pentrent weld metal
Please suggest how to solve the issue
Thanks in advance
Regards
PVKRaju

 

[weldstan]

Did you remove the oxide layer on the surfaces? This is pretty thick material. Did you preheat at 200F? Was your procedure qualified on reasonably thick material. Per ASME IX groove weld qualification on thin material qualifies all fillet welds but that does not mean that the welding parameters used are appropriate for thick materials.