Best setting for welding rails to ak receiver what is best for welding the rails to the receiver shell of an ak. Heat treatment of ak based receivers practical machinist. The commies always did a full heat treat on milled and stamped receivers. One option is to buy a finished receiver which is hardened at the factory. All you need is a mapp gas torch to heat treat the trigger group holes and the ejector. The ejector is very important to heat treat properly followed next by the hammer,trigger and sear pin holes. There is no need to have ultra high strength receivers for the bolt and carrier to ride around in. Oil gives better hardness and is usually safe on on a uniform part like a punch. In fact, carbon, of itself, without heat treatment, strengthens iron at the expense.
Im the type of bladesmith that learned about heat treating as a stepbystep process, tried it and it seemed to work. There is a reasonable basic explanation of the theory, though not in the detail you can find in texts aimed at industrial users. I read this in a book called bedside reader or something like that. If youre feeling adventurous, do the entire receiver. Learn how to build your own ak with the rifle dynamics ak. This book is a sensible choice for someone considering doing heat treating of steel at home or in a small shop. I havent applied it yet but i might get to start the oven for the first time today but ive read the book and it seemed very clearly written from my newbie point of view. I know this was mentioned above but, it is a good way to create an oxygen free wrap. I have never tried it on an ak receiver, but i use this technique when heat treating knives. Hardening, tempering and heat treatment workshop practice. Banerjee, in comprehensive materials finishing, 2017. Use clean motor oil to quench this will leave just a little elasticity, water quenching doesnt do thisheat till its orange, dunk in oil.
Heat treating drill rod w1 weld talk message boards. Hardening of steel by a defined heating followed by rapid cooling. Youll need to quickly heat treat the pin holes as well as the ejector. Because you want your receiver to last, you need to heat treat a few parts.
To harden and temper a part is a science in itself and takes time. Been doing it with great success for more than 30 years. Heat treating the pin holes is a bonus not a detraction and the only part of the sheet metal receiver that really needs heat treat is the ejector. However, i must take exception to your statement heat treatment doesnt happen until the moisture is driven out. From the heat treating databook and mfrs recommendations.
I have tapped holes in a2 and s7 material that gets heat treated. This blankrails will fit all 1mm ak 47 akm kits russian, romanian, polish, hungarian, east german, bulgarian, egyptian, ect. Most things i make dont require heat treatment, so i have little experience in this. A third option, often favored by small shops and home builders, is to perform a spot heat treatment of the receiver. Heat treating ak47 reciever flat florida gun forum. The hammer trigger pins will need to be reamed out to 7mm after bending. The correct heat treating on ak receivers is between 38.
This ratio, however, does not give the whole story of nickelchromium. At the risk of annoying the curmudgeons i have read a lot about heat treatment, tempering etc. Why dont the receivers on the g3, cetme, and cetmel. I figure that the least i could do before heat treating would be to drill the center support river hole and other river holes as well as dimple them as ream the fire control holes. And they have dowel holes in the parts, do you adjust the hole size for heat treat in these materials.
Chasing the holes, means to drill out the receiver sheet metal so it lines up. All the firing load in the ak is taken up by the locking lugs on the bolt and trunnion. If you want the rifle to last this heat treatment must be done, however it can be done at the end of the build as only the ejector part of the rail absolutly needs ht and its easy enough to get a flame on it. Original polish manufactured ak 47 blank fully heat treated lower rails spotweled in top rails trimmed to spec mag stabilizers trimmed. Asm metals reference book and asm heat treaters guide, american society for metals international i recommend both the above books for all knife makers that do their own heat treating. Parkerizing is just as simple and doesnt require a lot of fancy gear. Both books include graphs and charts with more detail than can be produced here.
There is quite a bit of practical advice on smallshop methods, which is not wellcovered in industrial. It makes it a nightmare to drill into them and theyll eat up cobalt bits all day long. To prevent drilled holes near edges from cracking in hardening,take a flat nosed punch,and stuff the holes as tight as possible with fine steel wool. Another is to fully heat treat the receiver yourself using a kiln or a forge, but the equipment for this is fairly expensive. The heat treating on the ak receivers is mainly for the fire control group and trunnion holes to harden them. Otherwise you will end up with a hot metal pretzel.
Page 1 of 2 what are the legalities on offering full heat treat for 80% receivers. One simple technique, used by master bladesmiths, that will prevent your knife from shattering, even if its your first time making a blade the biggest heat treating mistake you could be making, that is ruining the quality of your blades 1 crucial heat treatment step, without which your whole heat treatment. There were photos of egg shaped axis pin holes on a bwest. Ak 47 blank polish stamping non ffl childers guns llc. The dowel holes are just press fit but my concern is will they be. The commies built the heat treating fixtures that allow full receiver heat treating and always did a full heat treat job. Annealing prior to hardening sign in to follow this. Product instructions receiver flat instructions ak builder. If we take the resistance to set as one of the primary reasons and benefits of heat treat, then i think that there is a tremendous amount of anecdotal evidence that. Not sure why there would be any issues with the oow receivers on the heat treating.
Press question mark to learn the rest of the keyboard shortcuts. Discussions about the joys of owning and operating ars, ak s and other military rifles and ammo. I am heat treating the entire receiver via a kiln once i sort through the dozens of various opinions on the proper way to do it. Ak builder receiver flat instructions material 4 chromemoly annealed steel on rails and flat these flats were designed to be bent and assembled like a manufacturer was trying to make a receiver with that in mind the problems associated with predrilled holes in rails and holes too close to a. Just wanted to see if anyone had proof of these b west ak 47 usa receivers. Get a bucket of water and your mapp gas torch, heat each hole up until its glowing orange then dunk it in the water. I used regular quenching oil and tested the hardness. Akbuilder receiver flat instructions material 4 chromemoly annealed steel on rails and flat.
If it is the text book long soak and slow cool routine that you speak of, and the goal is to produce coarse pearlite for the end. Annealing is a process of making relatively soft steel hard so that it will hold a sharp edge. Since the bolt carrier is constantly applying force to the pins, those pins transfer that force directly to the receiver. The ejector area on the left lower rail can then be heat treated with a propane torch heat to cherry red, quench, reheat to 600 deg or so. Dealing with distortion during heat treat processing eps. The receiver in this video will not be on the finished rifle. Do you oversize taps in these two materials before heat treat. This will create an oxygen free environment during heat treating. Care must be taken while welding the lower rails on not to over heat the blank and ruin the temper of it. Dealing with distortion during heat treat processing following a few basic rules can often minimize troublesome distortion that takes place during the steel heat treat process. Using our receiver flats rails and center support these receivers are bent rails trimmed and fully heat treated then the rails are aligned and welded we are. Learn how to build your own ak with the rifle dynamics ak builder.
The wood chips will stop combustion after all of the oxygen has been consumed. The fact that any of the receivers are heat treated is amazing since the only real areas that could use hardening of any type are the pivot holes and the ejector which oow does heat treat. These holes will need to be heat treated after reaming. Some receiver manufacturers attempt to counter this by only heat treating these holes, which is just as bad as not heat treating. It also showed me that 1095, even with a thin crosssection, is a shallowhardening steel. The correct heat treating on ak receivers is between 3840 on the. Should you dimple your ak receiver this feature is not available right now. Use a neutral flame,bring up to temperature then quench.
The two ak builder flat receivers that i bent would not heat treat properly. I read the b west receivers made in the us were not heat treated properly. Making knives from old table saw blades feltmagnet. This was done by heating those parts with an oxyacetylene torch then quenching in. Once completed i performed spot heat treating to harden the hammer and trigger pin holes so that they will resist wear. Trigger guard riveting and front trunion drilling were continuing our diy aks74u krink build today by riveting in the trigger guard and starting the process for installing the front trunion, which in this article, includes fitting the front trunion, marking the rivet holes and drilling them out. If you dont heat treat at least the holes the holes very quickly wear out eggshaped.
Childers guns balnks still require the lower rails to be welded on. Sheet metal stamped, bent by jjig, just needing to weld the rails in. Quenching cooling an overview sciencedirect topics. They never didnt do any heat treat, nor did they just do the holes. Its also possible to heat treat a receiver too hard, which can cause it to crack along the sides where theyre bent when formed. The ambient temperature at cm underneath the spinneret holes must be kept. Ak builder sells a jig to drill the holes on the polish blanks. Firearm discussion and resources from ar15, ak 47, handguns and more. Borrowed all of my relevant books on the subject out the other day and wouldnt you know it i need them today. Page 1 of 5 80% polish receiver frankenbuild posted in ak rifles. They require slightly different treatment during heat treatment. The process requires heating the steel to a bright cherry red then quenching it in liquid to cool rapidly, but not too rapidly.
Build your own ak47 or ak74 from a parts kit or just repair and replace your existing ak. Use clean motor oil to quench this will leave just a little elasticity, water quenching doesnt do this heat till its orange, dunk in oil. February 27, 2019 featured news, manufacturing heat treat, manufacturing heat treat news our reader feedback feature allows us to facilitate discussion between heat treat today s content contributors and hardworking folks in the shop who have questions about an article. Heat treating ak 47 and ak 74 receivers to test new rack. If you insist on heat treating the entire receiver, make sure that whoever you entrust it to is experienced in hardening ak receivers and has the proper jig to do it with. Thats what i like about h, its very easy to heat treat by eye. Product information is true and, to the best of our knowledge, exact, but may not define the complete. H question heat treating, general discussion i forge. There are three major areas where distortion can take place, assuming the part is straight prior to heat treatment. Center support hole will be drilled to 532 after welding in the rails the hammertrigger pins on the operator side will need to be reamed to 5mm. This method is derived from twistednecks procedure for a full heat treat.
I plan on heat treating the holes first, then heat treat the rails, then welding them into receiver. Winner of the newbery medal and the national book award. The only parts of an ak receiver that require hardening is the ejector and the axis pin holes. Heat to 1950f orange bordering on yellow cool in front of a fan or in oil if youre feeling lucky.