Weldtek
I tend to be in agreement with your assessment, however what is the purpose of UW-38? This is my hold back,UW-38 is applied after conducting RT repairs as noted in UW-51. Would any other weld area not RTd be required to meet UW-38? Or just weld repair area?
Thanks guys enjoy the...
All,
Researching acceptance criteria for pinholes and elongated indications open to the surface. The item in question meets acceptance standards for Appendix 6 for MT and Appendix 8 for LPT that can be open to the surface. UW-38 address repair of defects and states pinholes open to the...
Moltenmetal,
You answered my question, the material can not be identified and is not acceptable to B31.3 for fabrication.
It is the fabricators responsibility to ensure that the materials used meet the requirement of the code.
How does an unmarked piece of 'silver' colored pipe comply with the requirements of B31.3 that code material was used??
There is NO markings or color code on the 'silver' pipe. No job#, sketch, etc.....
Usually depends upon design not maintenance, sad to say. Today we try to create as much heat transfer possible in the smallest area possible. This often means tubes are spaced very close together. Having said that, the required leg size will determine the depth of the bevel, size of the fillet...
If your are pressing the parts together with significant force, welding, immediately releasing the force you may be creating cracks at the weld termination.
Suggest dye penetrate testing these areas.
SntMan,
Seen this several times, heavy duty lubricants/grease, shrink wrap and even protective tape used for gasket surfaces. All of these failed to protect the surface of the machined hub. Even with grinding all internal welds flush, inserting templates with the same tolerances.
Check inside...
Try contacting someone in your area that is experienced with plate and frame heat exchangers. These are prone to leaks for several reasons, some are:
Incorrect gaskets, gaskets not glued,
Some plates are welded with no gaskets, welding issues
Plate thickness, incorrect process for plate/gasket...
TheRyno,
What is causing the weld to leak?
Are you blowing thru the .049" tube wall or not fusing?
I agree with stanweld, your parameters need to be modified, however the condition causing the leak will depend on how you modify. Another parameter to consider is the diameter of the wire.
If...
Fizza
You could calculate the heat input for each method used. However weld quality should be considered.
personally GTAW would be preferred, this would require small diameter tungsten and rods. The amount of metal deposited is very controlled by the welder. For example rod can be feed at a...
jgibbs22,
Question 2:
YES, Even if it was not a code requirement to RT, and you have discovered a condition that exceeds the applicable fabrication code, it is to be repaired to that code.
Why was the weld in question radiographed to be begin with?
Let me ask you another question:
If you...
Contamination of stainless steels by contact with carbon steels has been a issue for years. I do not fully understand contamination of the external surfaces of components that are not heated or welded.
First of all what is the main source of the contamination from the carbon steel.... carbon...
JR97
http://www.k2technde.com/downloads/Angle%20Bm%20General.pdf
Follow the link above youmay have to cut and paste into your browser.
The chart used in the AWS training course is typical of those used by Krautkramer. Etc. The longitudinal velocitys are the same. Take in mind this chart...
The longitudinal velocity of carbon steel and stainless steel are the same. The shear velocity of the CS and SS are significantly different and will impact the test results. This has been done in the industry for many years, most step blocks are carbon steel with a nickel chrome protective...
