All the heat cycles from the welding have compromised any original heat treatment. The overall strength is likely to be less than half the original strength. I give it two weeks.
If truckwill be overloaded again, the spindle will break in the very same section. Any welding is weaker than the two steel compositions, it is a superior quality steel for the spindle production. Conclusion: it will break again soon in the same section.
Wrong. It will break on one side of the weld or the other. As they are different hardness metals the weld in this case is softer and a bit more flexible. It will be put on an overloaded truck and it will break. But most likely on the outboard side of the weld. Also never mind repairing the beat up threads on the end of the spindle. Nothing to see there at all
if you actually weld you'd know that the weld will be stronger than the base... only an overload will break this repair which is apart of their culture... the repair is proper... the client will still choose to overload it
I have great respect for these hardworking people You can repair almost anything, but not this part that concerns traffic safety. You put people's lives in danger.
well if it was heat treated and annealed after the fact it might hold up.. but man im not so sure i would ever trust it ...looks like a steering knuckle too.. poor nations got ta do what they need to.. maybe all our bombing the entire middle east was not so smart
I’d really like to if and how long that spindle holds up for. Regardless of this or that you definitely have to give the man some credit for trying to repair it for what he has to work with. Quite impressive honestly.
This would probably snap right off after about 20 feet down the road. This is a drop forged and machined part that has the grain structure aligned during the forging process, It has lost all of its integrity by being snapped and welded.
Fantastically resourceful and skilled repair. The one thing that always worries me when welding takes place in the lathe is where is the earth clamp? If it's just placed on the bed either all or some of the current will be passing through the headstock bearings which will drastically shorten their working life and accuracy.
For material experts ; its not question about if this part conforms to OEM specification or not. Parts are expensive and the lead time maybe very extensive means loss of business. The idea is to get the truck back on the road earing money 💰. The skills demonstrated are commendable
Puedes hacer una variante. Perfora la charnela hasta tener un diametro similar a la punta que se quebro Inserta un trozo de acero 4140 a prensa con la charnela en caliente y lo sueldas por atras con 7018 Luego una vez fria procedes en el torno a elaborar la punta de eje Esa es la forma que a mi me ha dado mejor resultado
Получилось красиво. Все в размер, сотка в сотку. Цапфа отливается и остывает в форме, затем ее обрабатывают. Это монолит. И если этот монолит сломался, то восстановленная сваркой цапфа не внушает никакого доверия. В самом нагруженном на излом месте появились внутренние напряжения, а возможно и пузыри. Не надо забывать и про то, что там, в Пакистане и Индии транспорт работает с перегрузом... Это традиция такая, пошло это с вьючных ишаков...
Метод в принципе рабочий. Единственное, штифт надо садить под прессом с натягом и наплавку делать на автомате под флюсом, затем делать отпуск чтобы снять напряжение в месте наплавки, и потом уже обрабатывать на токарном станке.
@@werke3268 с этим согласен. Но ничего этого мы не увидели. Подгон в размер, а сварка не та. И никакой термообработки: отпуска в печке, повторной закалки. На от@@бись.
@@werke3268 метод рабочий, говорите? Это только в том случае, когда деталь разрушилась вследствие некоего форс-мажора - единомоментного превышения расчетных нагрузок. Но у них дикие перегрузы - норма! И уж если оборвало заводскую ось, то никакие ремонты не помогут. Там еще и резьбы под гайку не очень много осталось.
Incredible machine work but i wouldn't trust it after. If a forged casting broke how good do you think a repair would be after? This part can cause death with a wheel falling off
These guys do repairs on items that practically never fail in western countries. Why do they fail in Pakistan? Three reasons: # Terrible roads with pot holes that overstress suspensions; # They overload their trucks; # the parts were locally made from melted scrap metal of unspecified properties. So, in that context, frequent breakdowns and accidents is what they think is normal and has to be endured.
Welcome to the real world for most people. A place of actual mechanics and not just part changers. Send the guy a new spindle if you're so concerned. I'm sure they would love to have it.
@@LexusGX460-OFF-ROADif you work at my shop and you weld in one of my lathes without a proper grounding harness, I will kick your ass into oblivion. And so will every shop owner.
it's a technique that is just good enough to repair a donkey cart, you don't replace a part that is originally a forged part with welding in addition to arc welding with all the inclusions. It's simply dangerous I pity the driver of the truck no wonder there are many who leave their skin there.
this is surely why there are a lot of deaths on your roads and one wonders why the engineers designed such parts if it was not for safety. I am a mechanic and I would never dare to do a job like this and risk the lives of the drivers. I can see what difficulties they find themselves in on the road. They have all my esteem and I say bravo to them.@@okgroomer1966
Судя по виду и качеству работ, эти трудяги ни когда не останутся без работы, это с однойстороны а с другой, они умеют, они хотят, им надо и они работают и ни кого не ждут и не ноют что всё плохо а берут и делают а главное делают всё, это достойно уважения
Сделать поворотный из сварки -это качество? Все эти ремонты - курам на смех. Сколько такой кулак проездит? Моторы ремонтируют на коленке на улице. Этот мотор уже при сборке идёт с задирами и песком внутри)) Поршня, коленвалы вытачивают сами. О каких технологических тонкостях тут можно говорить?! О каком качестве? Какие микрометры может выдержать станок, которому больше лет чем Ленину?
Видимо, поворотный кулак стоит дороже грузовика, груза, жизни водителя и тех кого убьёт этим грузовиком, когда ПЕРЕДНЕЕ колесо оторвёт. Те кто пишет, что нормуль всё будет ничего не понимают в машинах и металлообработке. Кулак это ответственная деталь, потому, она кованная, из качественной стали, с термообработкой и контролем на предмет трещин. А это поделие запросто лопнет и гроб видимо сильно дешевле кулака. На ТО авто не допускается сварка рулевых тяг . Тут кулак передний, одноразовые люди.
it's not a hacked repair... it's a textbook open root weld with a post and then machined. Welders do this every day worldwide. Alaskan pipeline was joined/repaired the same way. Overloading is not the responsibility of the machinist
Yet it's done all the time and lasts. They wouldn't keep doing it if it didn't last. The welded area is probably stronger than original if they used the right rods.
@@LexusGX460-OFF-ROAD Western "mechanics" get bent out of shape if it's not always new parts going in. Repair has become sacrilege to most. It's rather odd considering we used to do it too before everything became unservicable junk.
You should be able to do a repair that will work on that. Mount it up on the lathe and pour out the center where that spindle goes but don't go all the way to the edge of that disc like part. Just bore out the diameter of the spindle. Now get a good piece of metal that's already heat treated and turn it down. Good carbide tool should cut it, but If it's too difficult, you could use a tool post grinder. Make a step in the shaft about 1/32" over the hole diameter. Maybe 1/64":(hard to tell without actually holding the part in my hand). Then make a second step about a half inch past the thickness of the knuckle. Champfer that edge. The temp difference is about 400F. You could probably heat the one part and avoid the dry ice if you had to. You can make up some by heating more, but you can start getting close to the temperatures that anbeal thf metal if your not careful, depending on your alloy. The expansion coeficient should he around 0.0000065/F. So multiply your hole diameter by that, and then multiply by your temperature difference. (Dry ice is around -100F) So a 2" shaft at a 400 degree difference should get you about 0.0052". So make it about 3-4 thousandths over. It should drop right in. The lock in place and never come out. shaft. Then turn the spindle profile down on the front side and cut the shaft off the back side. You could probanly get away with making the shaft a bit smaller and pressing it in. If yoyr a bit nervous about it just being pressed in, before you cut it you could cut oyt the center of tge back side to a quarter inch above the surface, and then peen over the edge so that there would be somthing holding the spindle on if sonething goes catastriphiclu wrong like the knuckle cracks. Would i fix that? Probably not unless I had no other choice. But it could be dove in a way that should hold.
Vernier… “very near”?…… for precise press fits? Spindles usually bend instead of breaking at that point. How did it break?.. wreck? Not sure I’d trust it. Broken spindle would give you a wild ride
This truck was most likely overloaded from the start, I'm sure they will overload it again. In the long run, they would have saved money to just replace the part. When it breaks again and I mean soon the truck will be out of service and not making money.
They make these repairs all the time. You're correct they'll overload it and the bad roads will break it again. You are wrong if you think it's much weaker than original. If you ever travel to the 3rd world you'll be amazed at the vehicles they keep on the road. Almost everything is repaired out of necessity.
All the comntators there is one very important point you're not seeing or thinking about. Offcourse it will break when ever it is over loaded. This repair will buy him time till he make some money. It is a good idea.
Многие пишут про термаобработку и прочие заводские нюансы, учитывая что это передняя ось и нагрузка на неё не большая относительно задних осей, так что ещё 100 лет проходит потому что сварка правельная и электроды высокого качества, сам занимаюсь производством и точно знаю что говорю , а эти ребята знают не хуже нашего что и как делать , так что молодцы!!!
Disculpe pero discrepo con su opinión ,esa reparación está mal ,se debe fabricar la punta nueva más larga ,agujerear la mulequilla y soldarla por detrás , eso se lo dise emilio el tornero ,busque me en este canal .
Если на переднюю ось назгрузка небольшая,заводская напфа не сломалась бы...А этот ремонт на пару недель.Такие детали не ремонтируются,а меняются на новые.
@@emilioernandez9907 по нормам .на заднюю ось нагрузка 10-12 т,т.е 5-6 т на спарку . Причем и размер подшипников и длина ост сзади больше. А у передней оси нагрузка до 8.5 т.. т.е 4.,3 т на одно колесо.. Так что где больше нагрузка на ось..большой вопрос. Два...оси сваривать нельзя. Этому учат сразу..я уж забыл когда мне это преподавали. Если уж ось ремонтировать, то только через втулки с нулевой посадкой,а сварка только для финишной фиксации. В данном случае ..надо было выточить новую ось и установить с тело кулака и обварить в теле.
Как я понял, при наличии электричества, токарного станка и сварки, работа будет всегда! Мне понравилось, как сделана работа, но сам на таком авто ездить не стал бы, если узнал.
