· The difference between the 6G and 6GR positions is the restriction ring and the bevel preparation. 6G is prepared
as a single 'vee' at 45 degrees position with the horizontal plane, while the 6GR bevel preparation is a single bevel
and the two connecting pipes have different thicknesses, one is thicker by at least 4-6mm.
· What differentiates the 6G from the 6GR?
· Firstly, the difference between both is the R in the 6GR. The letter R indicates that 6GR welding consists of a restricting
ring. Another difference between the 6G and 6GR is the bevel preparation. Bevel preparation is a procedure done to
prepare the metal before one can start welding. The welder cuts a slope at a specific angle on the metal, particularly at
the edge.
· If you are familiar with the 6G and 6GR test positions, you will understand how important both are when welding pipe and
tubular structures.
· Now let's look at what the 6G and 6GR positions imply to help broaden our understanding of how they differ.
· What's the 6G all about?
· Firstly, the 6G position is the type whereby your tubular weld joint has to be included at an angle of 45 degrees. It's a difficult
test to pass, though not impossible.
· What is the 6GR all about?
· 6GR turns out to be more challenging, you will find a restriction plate wrapped around the pipe's circumference here. This plate
restricts the angle of the filler metal or electrode. And as a consequence of this restriction, welding becomes more challenging
than it should be.
· So, when you find a 6GR welder, know that the said individual has successfully overcome the obstacle in this test piece and
welded it perfectly to have gotten that certification. The R means there's an obstacle to overcome.
· Further, another notable difference is that obtaining the 6G certificate qualifies a welder to weld pipe butt in all positions. On the
other hand, obtaining the 6GR certification means the welder is qualified to weld structural TKY connections.
C Sridhar.
