ARTEC Scanner AM3E 1.06 Driver
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ARTEC Scanner AM3E 1.06 Driver
Many late model heads are fairly expensive and hard to find, so some heads that would have been scrapped because of cracks are now being repaired and returned to service.
It all depends on the market value of the head and the cost to ARTEC Scanner AM3E 1.06 it with a new or used casting. The higher the value of the head and the higher its replacement cost, the more sense it makes to repair the head rather than replace it.
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Furnace Welding Cast Iron Furnace welding cast iron is often called the black art of crack repair because it requires lots of heat and operator skill. Learning how to furnace weld cast iron is not something an inexperienced welder can pick up quickly. Those who have mastered the process say it takes at least six months to a year of constant practice to master it. If it were that easy, everybody would be doing ARTEC Scanner AM3E 1.06.
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It isn t, and that s why some shops have created a successful niche for themselves by specializing in furnace welding cast iron heads. To furnace weld a cast iron head, the head is first preheated to 1, F cherry red in an oven. This step is absolutely essential to minimize thermal shock and to relax the metal so it won t distort when the torch is applied to the casting. When the head preheat temperature has stabilized it takes about an hour, a neutral flame oxyacetylene torch with slightly more acetylene than oxygen is used to melt the cast iron which melts at 2, to 2, F. The trick here is to ARTEC Scanner AM3E 1.06 the weld clean by adding a little flux so the impurities will rise to the ARTEC Scanner AM3E 1.06.
The impurities can then be floated out of the repair area with the torch. When building up a worn or damaged valve seat in a cast iron head, a carbon graphite plug can be used ARTEC Scanner AM3E 1.06 fill the hole.
The weld is then built up around the plug. The puddle will be about half an inch deep and maybe two inches in diameter.
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It takes a lot of heat to do this, about 5, F. After the crack has been filled comes a long, slow cool down.
This step is also essential to prevent the head from recracking. If cast iron cools too quickly, the surrounding metal can shrink away from the weld causing new cracks to open.
Carbon in the iron can also turn to carbide making the metal too hard and brittle to machine. The casting must therefore be cooled very slowly to prevent these undesirable metallurgical changes.
Slow cooling can be accomplished by wrapping the head in an insulating blanket and keeping the head in a hot box so it will cool at a rate of no more than F per hour. At this rate, it may take 8 to 12 hours to slow cool back down to room temperature. ARTEC Scanner AM3E 1.06
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Once the head has cooled, it can be cleaned to remove scale, machined and pressure tested a second time to recheck for leaks. If no leaks are found, the final machine work and assembly can be done.
Some shops will even pressure test the head a third time if it has pressed-in valve seats to make sure no cracks opened up after the seats were installed. Because of the high temperatures involved in furnace welding, the induction hardening of integral valve seats is usually destroyed. This may require replacing the exhaust seats so the ARTEC Scanner AM3E 1.06 don t pound out when the head is returned to service.
For this reason, some shops prefer to braze weld cracks rather than furnace weld. With braze welding, the job can be done at to F so the head doesn t get as hot. Flame Spray Welding Another ARTEC Scanner AM3E 1.06 for repairing cracks in cast iron heads and blocks is flame spray powder welding. The process is similar to brazing but uses nickel powder and a special torch to produce high strength repairs.
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The basic technique for flame spray welding cast iron ARTEC Scanner AM3E 1.06 been around for 40 years but has only recently been adapted for automotive applications. The main advantages of this technique is that it is easier and faster than furnace welding. Flame spray welding can create a strong and long-lasting repair the same as furnace welding but without as much heat.
The head still has to be preheated and postheated, but not as much nor as long.