User:Twowheelappl/sandbox

My preferred choice is to update three articles: Zeppelin NT has a reference to Thermic welding as a method of joining plastic airship hulls. I believe this is a mistaken reference to some form of Plastic welding which I would like to correct. Further, I think the Thermic welding article should be improved to include the welding related information from the Thermite article (and potentially replace that section, or at least link to it) as well as updated to include some additional details relating to analysis of thermite joints (I have completed an initial literature search and have found some articles related to modeling thermite welds along with some alternative energy research involving thermite as an energy storage medium and thermal models of its use in that capacity.)

My second choice would be to update the Friction welding article (particularly Spin welding probably) to include information on friction hydropillar welding/friction taper plug welding. I have not done as much initial footwork on this one, though.Twowheelappl (talk) 11:04, 19 October 2017 (UTC)

Instructor Comments
Adding heat flow modeling of thermite or exothermic welds would to the existing Exothermic Welding article would be good.

Draft Edits For Peer Review (Thermite)
These changes have already been made to the thermite article:

Was:

"However, defects such as slag inclusions and voids (holes) are often present in such welded junctions and great care is needed to operate the process successfully. Care must also be taken to ensure that the rails remain straight, without resulting in dipped joints, which can cause wear on high speed and heavy axle load lines."

Is:

"However, defects such as slag inclusions and voids (holes) are often present in such welded junctions and great care is needed to operate the process successfully. Both Finite Element Analysis and experimental analysis of thermite rail welds has shown that weld gap is the most influential parameter affecting defect formation.  Shrinkage cavity formation and cold lap welding defects are reduced by increasing thermite temperature, increasing preheat, and increasing gap.  However, these all promote microporosity.  Care must also be taken to ensure that the rails remain straight, without resulting in dipped joints, which can cause wear on high speed and heavy axle load lines."

These changes have already been made to the thermite article:

Was:

"Because standard iron-thermite is difficult to ignite, burns with practically no flame and has a small radius of action, standard thermite is rarely used on its own as an incendiary composition. It is more usually employed with other ingredients added to increase its incendiary effects."

Is:

"Because standard iron-thermite is difficult to ignite, burns with practically no flame and has a small radius of action, standard thermite is rarely used on its own as an incendiary composition. Increases in gas content of the reaction products of a thermite increases the heat transfer rate (and therefore damage) of that particular thermite blend. It is more usually employed with other ingredients added to increase its incendiary effects."

Twowheelappl (talk) 22:13, 16 November 2017 (UTC)

Draft Edit for Peer Review (Zappelin_NT)
See https://en.wikipedia.org/wiki/Zeppelin_NT#Hull_and_structure Twowheelappl (talk) 22:13, 16 November 2017 (UTC)

Final Edit Incorporating Peer Review
I had considered increasing the content of heat transfer modeling information in my final edit, but most of the peer reviewers indicated that as the draft stands, it has a good balance between detail and accessibility. I did add one additional detail about the modeling. Other than that, only grammatical changes were made.

The article edits now read:

thermite:

"However, defects such as slag inclusions and voids (holes) are often present in such welded junctions and great care is needed to operate the process successfully. The numerical analysis of thermite welding of rails has been approached similar to casting cooling analysis.  Both this Finite Element Analysis and experimental analysis of thermite rail welds has shown that weld gap is the most influential parameter affecting defect formation.  Increasing weld gap has been shown to reduce shrinkage cavity formation and cold lap welding defects, and increasing preheat and thermite temperature further reduces these defects.  However, reducing these defects promotes a second form of defect: microporosity.  Care must also be taken to ensure that the rails remain straight, without resulting in dipped joints, which can cause wear on high speed and heavy axle load lines."

thermite:

"Because standard iron-thermite is difficult to ignite, burns with practically no flame and has a small radius of action, standard thermite is rarely used on its own as an incendiary composition. In general, an increases in the volume of gaseous reaction products of a thermite blend increases the heat transfer rate (and therefore damage) of that particular thermite blend. It is more usually employed with other ingredients added to increase its incendiary effects."

Twowheelappl (talk) 18:40, 9 December 2017 (UTC)