ch 39 metal urgy
pre heat temperatures for carbon steel range from depending on carbon content
200 to 700
the clip test is not applicable produces good results on sections up to thick
3/8
preheating temperatures for stress relief should be in the range of
900 to 1250
steels are the easiest to Weld since now special welding preparations are necessary
LOW carbon
steel is suitable for cold bending and cold forming because it's high ductility
RIMMED
Ben Knight is more brittle than martensite informs A at a faster coin rate
false
high carbon steels are significantly easier to Weld than other carbon steels
false
hydrogen cracking is commonly detected by common non destructive's amination techniques
false
in semi killed still no deoxidizers are added during production
false
post heating temperatures for chromoly steels are typically lower than for carbon and low alloy steels
false
the ductility of autistic magnis steals increases when the steels are reheated
false
is not normally used to Weld free machining steels
gtaw
in free machining steels can melt during welding an meeting Weld fumes an creating health hazard
lead
Welding current in welding speed must be used when welding chromoly steals
low slow
is the process of removing a controlled amount of oxygen from steel during steelmaking
steel deoxidation
Carbon steels are alloys of iron carbon and magnesium
true
Graphite alization is the formation of iron carbide that results in loss of ductility
true
carbon is the alloying metal that has the greatest effect on the mechanical properties of steel
true
carbon steel with a carbon equivalent less than zero point 4% is weldable without pre heat or post heating depending on joint member thickness
true
free machining steels are not usually welded unless absolutely necessary
true
killed steel is completely deoxidized during steel production by adding Silicon or aluminum
true
martin site that forms an low carbon steels is generally too soft and ductile to cause an brenneman or cracking
true
medium carbon steels are stronger than low carbon steels
true
post heating is a stress relief treatment for welding medium carbon in high carbon steels
true
rimmed steel is steel with little or no deoxidizers added during steel production
true
the interpass temperature is the temperature of a wild area between passes of a multiple pass Weld
true
the recommended Preheat temperature for low alloy steel is about 50 degrees Fahrenheit above the temperature at which marked insight begins to form on cooling
true
