Welding Chapter 27

To improve weldability in stainless steel, the carbon content should not be more than ____%

0.03

Low carbon steel has a carbon content of less than _____ %

0.30

Medium carbon steel has ____ % carbon content.

0.30 to 0.50

For steels containing more than ____% carbon, preheating and subsequent heat treatment generally are required.

0.40

High carbon steels usually have a carbon content of ____%

0.50 to 0.90

The carbon content of high manganese steel is ____ %.

1 to 1.4

Chromium carbides form when the metal is between _____ Fahrenheit.

800 degrees and 1500 degrees

In both steel classifications systems, the first number often, but not always, refers to ____.

the basic type of steel

The ability of carbon steel to be welded is a function of ____.

the carbon conten

In the steel classification system, the last two digits refer to ____.

the range of carbon content

Most welding processes produce a(n) ___ in which the metals are heated over a range of temperatures.

thermal cycle

All five types of cast iron have carbon contents ranging from ____%.

1.7 to 4

The weight of magnesium is _____ that of steel, and ___ that of aluminum.

1/4, 2/3

High manganese steel contains ____% or more manganese.

12

Pure aluminum melts at ____ Fahrenheit.

1200 degrees

If the chromium-nickel content of a stainless steel is referred to as 25-12, then it contains ______.

25 percent chromium and 12 percent nickel

Why are fluxing materials used for welding?

Because some metals are reactive to the atmosphere when heated

In the AISI system, the letter ___ indicates basic open-hearth or electric furnace steel and basic oxygen furnace steel.

C

Which of the following is a stainless steel alloy group?

Ferritic

_____ stainless steels are used for ornamental or decorative applications such as architectural trim, and tend to be brittle.

Ferritic

____ stainless steels are used in applications requiring both wear resistance and corrosion resistance, such as surgical knives and razor blades.

Martensitic

The strength of ____ stainless steels is the result of a special heat treatment.

Precipitation Hardening

When welding tool steel using the gas welding method, the rods selected for welding repairs should have ____.

a carbon content matching the base metal

Steel is classified according to _____.

basic chemical composition

Which of the following is not a common defect if the wrong filler metal is selected for a weld?

underfill