procedures
Is hot welding necessary to properly weld on large cast iron
Not really, on large cast iron it is preferred to preheat.
But smaller wells can be cold welded instead of hot welded.
the major difference in welding joint design for grey cast iron compared to other base metals is the larger included angle, which can be as large as ___ degrees
large as 90 degrees
A common procedure for cold welding is to deposit one small well bead around ____ millimetres and ____ inches
1 inches, 25 mm
When is the optical time to peen?
Temperature wise
When the world cools to 540 Celsius
normally Grey cast iron castings are made by pouring ___ __into ___
made by pouring molten metal into a mold
Low carbon sheet or plate can be used as a patch. The thickness of the low carbon steel patch should not be more than ____ of the thickness of cast-iron.
should not be more more more more then 60% of then the thickness of cast iron
:)
What is the aim welding cold
Minimize stress, metal has opportunities to cool safely
Only short beads can be employed, usually what millimetres and what inches in length and
Double or nothing, peeing should be completely before the world cools to what Celsius
50 to 75 mm 2 to 3 inches in length
Peeing before the weld cools to 505 140 Celsius
in a large weld joint on cast iron, cost of nickel filler metal can be reduced by limiting the amount of nickel filler metal. this is done by _____ (surfacing the weld with a nickel alloy, then completing the weld with a less expensive filler metal)
this is done by (Buttering)
Small castings need to be preheated at around 200 C to 300 C with an a acetylene torch.
Larger castings they need to be preheated at ___ C , in a fire brick oven or furnace.
Double or nothing! Guess the exact preheat temperature temperatures used for small castings
510 C for large casting
260 C for smaller casting
On the joints included angle should be 60 to 90° however on U joints what would be the angle?
Double or nothing: what should the route radius be?
Angle would be 20 to 25°
The root radius should be 4.8.
peening Is a __ __ process . It is perform to __ and __ the surface layer to prevent fractures and wear
peening Is a cold working process . It is perform to compress and strengthen the surface layer to prevent fractures and wear
How soon should you post heat and at what temperature should you do it at?
Double or nothing, what colour with the metal be while posting
as soon as possible and it should be
Answer for the bonus question is a blood red colour
Gas iron naturally absorbs what this what will be brought to the surface on the metal when heated
Double or nothing: welding surfaces will produce a poor quality, weld
It naturally absorbs oi oi oi oil will be brought to the surface of the metal when he heated
The answer for both question is oil!
During welding, a crack in cast-iron is a good idea to drill a hole or arrest hole about ___ millimetres and ___ inches in diameter just beyond the point at which the crack ends
3.2 mm
1/8 inches