What is 6GR welding Test position? 6GR welding test tips and welder qualification

What does 6GR mean?

6GR Stands for:

The number ‘6’ here stands for the Welding positions. 

The letter G stands for Groove.

The letter R means restriction.

6GR Welder test Position is specified in AWS D1.1 Code. While in ASME Section IX, there is only 6G Welding position for performance qualification. in the ‘6GR‘ term, ‘R’ means the Restriction Ring.

The main difference between a 6G Welding position & 6GR welding position are the:

  1. 6GR Position uses a restriction ring above the groove as shown in the below figure. This restriction ring is tack welded to the upper side pipe.
  2. 6GR welding test coupon uses a Single bevel joint (one pipe without any bevel preparation) while the 6G test coupon uses a Single V joint. Refer to the below sketch for joint details.
  3. 6GR Qualification Test Coupon pipes are having dissimilar thicknesses (usually a thickness difference of 3/16 inches). Pipe with higher thickness has no weld preparation. While in a 6G test coupon, both pipes have the same wall thickness.

The Lock ring or also Restriction Ring is placed at a maximum of 1/2 inches from the weld circumferential center line as shown in the below sketch. The lock ring restricts & simulates the actual restrictions observed during the welding of T, K & Y tubular connections.

So, what is T, K & Y joints?

Here, -Т, -К, and -Y letters refer to the type of joint shape in tubular connections. These types of joints are used to simulate the difficult welding conditions used during welding or -T, -K & -Y type tubular connections in structural welding mainly as per AWS D1.1 code.

6GR Welding Position due to the restrictions placed during WQT and one face without any weld preparation is quite tough to pass the welder test, mainly the root pass. So, before you weld a 6GR test coupon, practice for the 6G position in advance. Then it will be easy as you know the position restrictions and welding techniques.

Difference Between 6G and 6GR Weld Test Position

If you notice, you will find the difference between 6G & 6GR is the ‘R’ in the 6GR. The letter ‘R’ specifies that 6GR welding consists of a restricting ring where ‘R’ literally means Restriction.

Another main difference between welding position 6G & 6GR is the Weld Bevel Preparation. In a 6G test coupon, both the pipe pieces have bevels. The weld joint preparation is a Single V. But in the 6GR test coupon, one pipe is without bevel while other is bevel preparation. The type of groove is Single Bevel groove in 6 GR.

6G-vs-6GR welding position
6G vs. 6GR welding weld preparation

Additionally, in the 6G certification test, the welder has to weld in all positions while the 6GR position is for TKY joints. Both 6G position & 6GR welding position are meant for welder performance qualification. 6GR is as per AWS D1.1 while 6G is followed in ASME as well as AWS.

6GR qualified welders are not readily available as they require extensive welding skills to produce a sound weld. A very high level of welder skill (as demonstrated by the 6GR test) is required for the 6G weld test. So 6G test tends to be the most difficult test in a welder test certification.

6GR- Important Welding Test Position

6GR welding test position is the toughest Welding position for Stick (SMAW) Welder. Compared to the 6G welder test, 6GR brings more restrictions in the movement of the rod and viewing the weld puddle during welding.

6GR welding position is widely used for welder qualification for offshore platform structures welding is carried out by these qualified welders as per AWS D1.1 code. 6GR Welding position qualifies a welder to weld -T, -K & -Y joints.

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