THE LAST MELON.

Question 1

__________________WELDING IS AN ARC WELDING PROCESS IN WHICH A CONSUMABLE, FLUX-COVERED ELECTRODE IS FED INTO THE WELD AREA.

Answer 1

SHIELDED METAL ARC WELDING

Question 2

_________________WELDING IS A PROCESS IN WHICH A NONCONSUMABLE TUNGSTEN ELECTRODE IS USED TO STRIKE THE ARC, WHICH IS SURROUNDED BY SHIELDING GAS, AND WELDING FILLER METAL IS FED IN SEPARATELY.

Answer 2

GAS TUNGSTEN ARC

Question 3

MOST WELDING SPECIFICATIONS ARE PRODUCED BY THE ______.

Answer 3

AWS

Question 4

THE FIRST PART OF QUALIFYING A WELD PROCEDURE IS TO PREPARE A DETAILED __________

Answer 4

WPS

Question 5

IN A WELDING PROCEDURE, THE ACTUAL PARAMETERS USED TO WELD A SAMPLE ARE RECORDED IN THE _______.

Answer 5

PQR

Question 6

WHAT IS THE TENSILE STRENGTH OF AN E7018?

Answer 6

70 KSI

Question 7

WHAT OCCURS IN THE HEAT-AFFECTED ZONE OF SOME STEELS AS ATOMIC HYDROGEN DIFFUSES INTO THIS REGION WHEN THE WELD COOLS?

Answer 7

HYDROGEN CRACKING

Question 8

EXPLAIN THE EFFECT THAT THE JOINT CLEARANCE HAS ON BRAZING AND SOLDERING.

Answer 8

IF THE CLEARANCE IS TOO BIG OR TOO SMALL THE FILLER METAL MAY NOT FLOW THROUGHOUT THE JOINT.

Question 9

IN MAGNETIC PARTICLE TESTING THE COMPONENT BEING INSPECTED IS MAGNETIZED AND THEN COVERED WITH _________________.

Answer 9

IRON POWDER

Question 10

A ___________________ IS A SHADOWLIKE IMAGE OF A COMPONENT PRODUCED BY RADIATION ON PHOTOGRAPHIC FILM.

Answer 10

RADIOGRAPH

Question 11

_________________ TESTING IS AN NDE TECHNIQUE THAT USES ELECTRICALLY PRODUCED, HIGH-FREQUENCY SOUND WAVES TO PENETRATE SOLIDS AND DETECT INTERIOR DISCONTINUITIES.

Answer 11

ULTRASONIC

Question 12

__________________ UT, ALSO KNOWN AS ANGLE-BEAM UT, EMPLOYS A TRANSDUCER THAT TRANSMITS ULTRASONIC AT AN ANGLE INTO THE MATERIAL SURFACE

Answer 12

SHEAR-WAVE

Question 13

______________ TESTING IS USED TO DETECT SURFACE DISCONTINUITIES, SUCH AS CRACKS AND POROSITY, ON FORGINGS, CASTINGS, WELDS, AND OTHER COMPONENTS.

Answer 13

PENETRANT

Question 14

DESCRIBE THE ADVANTAGES THAT MT HAS OVER PT.

Answer 14

MT DETECTS MUCH FINER IMPERFECTIONS AND FLAWS, SUCH AS FATIGUE CRACKS, AND CAN DETECT IMPERFECTIONS THAT ARE NOT OPEN TO THE SURFACE UP TO 1/16” BELOW THE SURFACE.

Question 15

WHAT IS THE MOST IMPORTANT ALLOYING ELEMENT FOR INCREASING THE OXIDATION RESISTANCE OF METAL?

Answer 15

CHROMIUM

Question 16

WHAT OCCURS WHEN OXIDATION IS EXCESSIVE?

Answer 16

SCALING

Question 17

THE MOST IMPORTANT MECHANICAL PROPERTY IN METALS OPERATING AT HIGH TEMPERATURES IS_____________.

Answer 17

CREEP RESISTANCE

Question 18

______________ STAINLESS STEELS HAVE THE BEST SCALING RESISTANCE BECAUSE THEY HAVE HIGH CHROMIUM CONTENTS.

Answer 18

FERRITIC

Question 19

_____________ IS GRADUAL DEFORMATION OF A MATERIAL DUE TO LONG-TERM EXPOSURE TO STRESS BELOW THE MATERIAL’S YIELD STRENGTH.

Answer 19

CREEP

Question 20

EXPLAIN HOW SOLUTE ATOMS AFFECT CREEP RESISTANCE.

Answer 20

THE PRESENCE OF SOLUTE ATOMS TENDS TO INCREASE CREEP RESISTANCE BY INTERFERING WITH THE MOVEMENT OF DISLOCATIONS.

Question 21

**WHAT IS METALLURGY AND HOW DOES IT APPLY TO YOU AS A WELDER, FABRICATOR, OR ARTIST?

Answer 21

METALLURGY IS THE STUDY OF METALS. IT IS EXTREMELY IMPORTANT TO UNDERSTAND THE MATERIAL YOU ARE WORKING WITH. YOU SHOULD UNDERSTAND THE PROPERTIES OF DIFFERENT METALS SO YOU KNOW WHAT METALS ARE BEST SUITED FOR DIFFERENT PURPOSES. THIS WILL MINIMIZE MISTAKES AND MAE YOUR WORK SAFER, STRONGER, AND MORE DURABLE.

Question 22

**WHAT IS THE MOST IMPORTANT CHARACTERISTIC OF CARBON STEEL?

Answer 22

CARBON STEEL IS ALLOTROPIC, MEANING THAT IT EXHIBITS MORE THAN ONE TYPE OF CRYSTAL STRUCTURE, DEPENDING ON TEMPERATURE. THE PROPERTIES OF CARBON STEEL WITH CHANGE WITH THE CRYSTAL STRUCTURE AND CARBON CONTENT.

Question 23

**HOW IS WELDING STAINLESS DIFFERENT? WHAT PROBLEMS CAN OCCUR?

Answer 23

CLEANING AND JOINT PREPARATION ARE CRITICAL WHEN WELDING STAINLESS STEELS TO PREVENT CARBON PICK UP. THE WAY STAINLESS SHOULD BE WELDED DEPENDS ON ITS CRYSTAL STRUCTURE. FOR EXAMPLE, MARTENSITIC STAINLESS STEELS MUST BE PREHEATED TO OFFSET ITS TENDENCY TO CRACK. WHEN FERRITIC STAINLESS STEELS ARE WELDED GRAIN GROWTH AND LOSS OF TOUGHNESS CAN OCCUR. AUSTENITIC IS THE MOST WELDABLE, BUT IS MORE LIKELY TO WARP AND IS SUSCEPTIBLE TO SENSITIZATION.

Question 24

**NAME SOME UNIQUE AND DIFFERENT THINGS ABOUT WELDING ALUMINUM.

Answer 24

ALUMINUM HAS A FILM OF ALUMINUM OXIDE THAT MUST BE REMOVED BEFORE WELDING. ALUMINUM’S HIGH THERMAL CONDUCTIVITY AND LOW MELTING POINT CAN LEAD CAN MAKE IT DIFFICULT TO WELD.

Question 25

**HOW IS TITANIUM DIFFERENT?

Answer 25

TITANIUM IS EXTREMELY DIFFICULT TO EXTRACT AND PRODUCE. Ti CAN HAVE HIGH STRENGTH-TO-WEIGHT RATIOS. IT CAN HAS LOW DENSITY AND EXCELLENT CORROSION RESISTANCE, WHICH IS WHY IT IS OFTEN USED IN AEROSPACE AND MARINE APPLICATIONS. TITANIUM IS DIFFICULT TO WELD AND REQUIRES STRINGENT SURFACE PREPARATION. TITANIUM CAN EXHIBIT PYROPHORIC BEHAVIOR, MEANING IT CAN IGNITE WHEN SCRATCHED OR STRUCK.

Question 26

**AS A WELDER HOW DO I CHOOSE WHICH PROCESS TO USE IN WELDING?

Answer 26

THE WELDING PROCESS YOU SHOULD USE DEPENDS ON YOUR ENVIRONMENT (INSIDE OR OUTSIDE), TYPE OF METAL, THICKNESS OF METAL