Welding Preparation
Welding Preparation
(OP)
What type of weld preparation would you recommend for butt welding two 1" thick A36 plates that are 48" long, I am looking for full penetration. I am using flux cored 0.065 wire. What would be the minumum groove size and can I get away without preheating. As always I am limited on fabrication time so the quicker and dirtier the better.
Thanks
What is a good source for information like this?
Thanks
What is a good source for information like this?





RE: Welding Preparation
1. Assurance of full penetration, thru back grinding to reach sound weld metal and
2. Balance of residual stresses from welding
For a plate of 1" thickness, I would recommend a minimum preheat of 200 deg F and hold for 15 minutes at temperature before you start welding. Prehat is based on base metal thickness and steel composition, and not weld prep geometry.
As far as information, you can Google welding of carbon steel and come up with many hits including the site below for starters;
http://www.khake.com/page89.html
RE: Welding Preparation
Preheat: Table 3.2 Category B. 50 deg F is minimum so metengr's recommendations are fine
Prequalified Joint: B-U3-GF. Figure 3.4 for double CJP groove weld. This will provide groove peparation information. Groove angle shown is 60 degrees.
For double bevel CJP groove weld in butt joint look at Figure 3.4 joint dsignation B-U5-GF. Each bevel angle is 45 degrees.
Will the the member be vertical, horizontal, or inclined when installed?
RE: Welding Preparation
I am welding a cylinder that is 7' in diameter and 4' long. The cylinder will be mounted nearly horizontal (3 deg off) and will be rotated about its axis. This is not a pressure vessel.