What size pipe is used in a 6G test?
In general, the UA-28 pipe welding test represents a 6 inch schedule 80 pipe, which is being done in a 6g position by using a 6010 for root pass and also a 7018 fill and cap.
What is a G6 weld?
In the 6G welding position, the pipe slopes at approximately 45° from the horizontal (X) axis or 45° from the vertical (Y) axis. The pipe is in a fixed position, so the welder must move around the pipe to perform the welding.
Which welding position is easiest?
Also referred to as a “downhand” position, the flat position weld is the easiest and often the first weld that new students learn. The metals to be joined are placed flat, and the welder passes the electric arc over them, moving across the workpiece in a horizontal direction.
Is the 6G pipe test hard?
The 6G welding certification is far from easy to pass and has a lot involved. Because there is a lot involved this page is pretty long and I also took a lot of pictures. I do want to say I barely passed this certification and came very close to failing it!
How is capping pass performed?
Cap pass welds connect a hose and braid. They precede any fitting attachment welds and are judged based on several criteria, whether all braid wires are captured chief among them. Beyond a reduction in pressure ratings, once wires pull out from the cap pass, the area of the hose just behind it becomes more susceptible.
What is the hardest weld test?
The hardest and most advanced welding test is the 6G Pipe Weld. This requires a great deal of technical expertise as you’ll be required to move around the pipe as you weld. The pipe is placed in a fixed position and tilted at an angle of 45 degrees.
What is the hardest welding certification to get?
The 6G pipe weld is one of the most difficult weld certification tests to pass because the pipe is at a 45-degree angle and immovable. Welders performing the 6G certification test must weld in all positions including horizontal, vertical and overhead, and may have to weld both right-handed and left-handed.
What is a 1G weld?
Well, this is exactly what the different positions like 1G, 2G, etc denotes. The 1G position is used wherever the welder gets to weld in a horizontal position. Here, ‘1’ means flat and ‘G’ means the Groove. There are instances when this position is not desirable depending upon the pieces welded.
What is the hardest welding certification?
What is the capping process?
The capping process replaces the triphosphate group with another structure called the “cap”. The cap is added by the enzyme guanyl transferase. This enzyme catalyzes the reaction between the 5′ end of the RNA transcript and a guanine triphosphate (GTP) molecule.
What is 6g welding pipe?
The pipe welding techniques used and the procedure is also identical to the ASME section IX pipe welding certification. Since welding pipe in the 6G position covers all of the pipe welding positions the information on this page can be applied to welding pipe in any position.
What is the typical weld bevel for a 6G test coupon?
The below figure shows a typical weld bevel for a 6G test coupon. E6010 is a cellulose-type SMAW electrode. The arc of E6010 is very strong and there is no slag. A welding current of 60 amp to 75 amp is well suited for welding root run using 3/32’’ E6010 electrode.
What are the guidelines for welding the cap?
Some basic guidelines for welding the cap are as follows: Keep your electrode angle pointed to the center of the pipe at all times with very few exceptions. Keep your arc length as short as possible.
How to pass the 6g welding certification test?
Make sure you fuse the bevels edge by pushing the toe of the weld into it. Overlap stringer beads from at least 25% to a maximum of 50%. The goal is for the weld to have a single flat profile when finished. Below are pictures of the electrode angles I used to pass the 6G welding certification test.