What is Chrome Moly anyway? Well first, if you've searched the internet for Chrome Moly, I must tell you that the spelling Chromoly is actually correct. Chromoly is like steel on steroids. It contains chromium and molybdenum, a splash of mostly carbon and iron.
The grade most chromoly tubing is 4130. Here's what it means 4130: The American Iron and Steel Institute (AISI) has a numbering system that uses 4 digits to categorize steels.
The first digit indicates the major alloying element.
Take 1010 Carbon Steel, for example. The 1 is the steel carbon. The second number indicates the approximate percentage of the major alloying element. In the case of carbon steel, the number is zero because there is no major element alloys. The third and fourth digits indicate the carbon content of steel.
In the case of 1010 steel, they indicate that the steel contains about 0.1% carbon, or 0.1%, or point-one percent carbon.
OK lets look to 4130 chromoly.
The 41 in 4130 indicates the main alloying elements are chromium and molybdenum and that the steel contains about 1% chromium and molybdenum combined. 2 The latest figures show 0.3% carbon.
The reason 4130 chromoly is so freakin strong and why it performs so well when used in aircraft, bicycles, dragsters, etc. because the combination of chromium, molybdenum and carbon, and good treatment Thermal Standard, 4130 chromoly tubing to a combination of strength, toughness and ductility.
4130 chromoly tube has great properties and great strength to weight ratio. The trick is not to live that when welding.
There are some purists out there who insist that the welding Gas is the only way forward for welding chromoly tubing for small planes. The idea is that the slow heating and slow cooling part of the concert with welding gas is needed and where 4130 welded tubes are gas, it kind of stress relief at a time.
But with all available data on welding TIG 4130 chromoly tubing without the need to reduce the stress in me enough to feel good in the TIG welding it. Even for small aircraft
I just do that just welding in accordance with established guidelines and I do not use 4130 filler rod.
Learn more about Welding 4130 and find a buttload of other welding information, at http://www.weldingtipsandtricks.com/
the lays en show case (GIG) – Le Gang (BBBrunes cover)
