hi
when i wanna make sample of butt joint and weld it groove weld with weld prep ( with angle 45 , root face= 2 mm and root opening = 1.2 mm )
is it supposed to make backing weld first then weld the groove weld OR i can just weld the groove only without backing ??
this sample will be sent to the lab to make X-Ray test and make tension test also
this sample for PQR for some project and i wanna test it to approve the gas , wire and operating parameter