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Hi hay, Let me start off with a couple well known examples before we get to the welding part. Example #1: There is a condition know as detonation in pyrotechnics that causes firearm chambers to explode. When reloading a cartridge one can down load the required powder charge to a point that will cause the chamber to explode when the weapon is fired. That's correct by adding too litle of a powder charge, one will cause an explosion just as they would by adding too much powder. Were not totaly sure of the cause behind detonation as we can't reproduce the exact circumstances repeatedly to cause the same effect each and every time. What we do know is detonation causes many deaths each year from a undereducated persons taking the risk of adding to little of a powder charge. IMO, I think when the primer goes off it burns just enough powder to create enough pressure to cause the bullet to become sealed in the chamber but not enough pressure to expell the bullet. With the chamber 100% sealed, the existing pressure and heat, called latent heat of compression, will cause the unburned powder to ignite thus adding more pressure to the chamber. As the flame rocks back and fourth thru the chamber casing, it builds very high pressure of upwards of 3 times of the existing pressure obtained from the original powder charge or about 120000psi as each powder grain ignites. A typilcal small firearm chamber is only designed for about 100000psi maximum pressure thus you have a severe explosion from excessive pressure.
Example #2:
How does a diesel engine fire? Latent heat of compression. Here we compresss air and at the same time the air is superheated upon compression then we add a small charge of fuel oil just at the right time to cause a explosion thus driving down the piston thus extracting power from that movement. Are you seeing where I'm heading? You are in fact are fixing to make your own diesel engine and firearm chamber out of your cylinder by applying heat to a closed source of fuel, carbon. You have a charge of oil in a confined space that can not escape therefor there's only one conclusion that the project is a accident waiting to happen. High pressure vessel welding should be left to the very experienced of welders. There's just too many considerations to even began to write about here in the short space we have. Sorry guys but Mig would be a very poor choice here as you always get cold lapp for the first 3/8" of weldment when using Mig. T_Bone
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