Nccer Welding Level 1 5th Edition Review Questions and Answers

1.	What is the major function of the blanket on an arc welding electrode?
		a. Acts every bit a scavenger, removes oxides and impurities
		b. Influences incomplete penetration
		c. Liquefies the base metal
		d. Adds moisture and accelerates the cooling rate
The key is major function, and that is to purify the weld pool and weld metal. Incorrect respond. Please choose another respond.

2.	Square wave refers to the ____________.
		a. shape of the filler metal
		b. shape of the tungsten electrode
		c. shape of the output power
		d. shape of the power source control box
The shape of the output wave grade from this type power source is referred to as square moving ridge. These type power sources accept enhanced performance on a.c. They tin control the remainder, aamplitude, frequency etc… to allow ameliorate command of penetration and cleaning action. Incorrect answer. Please choose another reply.

3.	Shielding gases are used to protect the molten metal from _______.
		a. existence overheated and cooling to fast
		b. porosity and brittleness
		c. estrus and distortion
		d. existence likewise cold and non penetrating
The surrounding air around the weld pool, contains oxygen, nitrogen and hydrogen. These gases get into the molten weld pool and cause gas bubbling to class (porosity) and atomic number 82 to embrittlement and weld cracking. Wrong answer. Please cull another respond.

4.	Weld backing is used with a procedure that uses a separate flux and electrode to _______ .
		a. make the overall weld joint stiffer
		b. provide more weight to the weldment
		c. make the material thicker where it is needed
		d. support the highly fluid weld puddle and so it will not fall through the joint
Weld backing is used on the dorsum side of the joint to prevent cook through and to clinch consummate penetration of the weld joint. Wrong respond. Delight cull another answer.

5.	_________ is the weight of a volume of material compared with an equal book of water.
		a. Mass
		b. Density
		c. Specific gravity
		d. Heft
The density of steel is 490 pounds per cubic human foot and its specific gravity is seven.8 times that of water. Water weighs m Kg/thou3. Therefore, a cubic meter of steel would counterbalance approximately 7800 kg depending upon the exact grade of steel being checked. Porosity, slag inclusion or other types of discontinuities would reduce the weight but not the specific gravity. Wrong answer. Please cull another respond.

6.	A medium carbon steel has a carbon content of what pct range?
		a. 0.05% to 0.15%
		b. 0.sixteen% to 0.60%
		c. 0.60% to 1.seventy%
		d. 1.lxx% to 2.xv%
Wrong reply. Delight cull another answer.

7.	If a liquid weld puddle is at a very loftier level of energy, at what approximate temperature will the steel begin to solidify?
		a. 1333 F
		b. 2780 F
		c. 3200 F
		d. 3780 F
When welding, the melting point of steel (approx. 27800 F) versus the solidification point of the fast freezing flux or slag (approx. 32000 F)  is important to know. Also, it is of import to know that the melting bespeak varies with the carbon and alloy content of steel. Steel is magnetic until heated to a higher place the transformation temperature of approximately 1333 0 F. How fast the metal conducts heat will have a big effect of preheat and inter-pass temperature command. How much the metallic expands on heating and contracts when cooling needs to be understood to command buckling and baloney. Incorrect respond. Delight choose another respond.

8.	__________ is a groove melted into the base of operations metal side by side to the weld toe or weld root and has non been filled in.
		a. Cracks
		b. Craters
		c. Under fill
		d. Undercut
Undercut best describes this fashion. Some people desire to phone call it "under fill" but it is not correct, since it is not in the weld being located adjacent to the toe. Incorrect answer. Delight choose another answer.

9.	If the weld does not combine with another weld or the base metal information technology is referred to as:
		a. incomplete penetration
		b. incomplete fusion
		c. incomplete bonding
		d. incomplete inclusion
If the weld does non combine with another weld or the base of operations metallic it is referred to as Incomplete fusion. Incorrect answer. Please cull another answer.

10.	To make up one's mind if a welder is qualified, the welder must pass a ________________ exam.
		a. WPQR
		b. WPS
		c. PQR
		d. Code
WPQR determines if a welder is qualified to a Welding Procedure Specification. Incorrect answer. Delight choose some other answer.

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11.	Which term best describes the operation where a welder or welding operator has command of a molten weld pool and the weld pool has a side to side motion that is transverse to the travel direction?
		a. Oscilllation
		b. Weaving
		c. Whipping
		d. Both a and c
This welding technique would appear in the welding instructions or in the welding procedure specification. This by and large increases the heat input per weld pass, but will mostly reduce the full number of weld passes required to fill the joint. Incorrect answer. Please choose another answer.

12.	A broken surface is existence observed. A pocket-sized pore or inclusion type discontinuity appears as a round bright expanse. Which term fits this clarification?
		a. Nucleation
		b. Crack
		c. Web
		d. Fisheye
A fisheye is caused by the presence of hydrogen in the weld. If this appeared on a pause test of some type it may or may not be acceptable. Always verify the acceptance criteria per the code or specification. Incorrect respond. Please cull another reply.

xiii.	Arc time is:
		a. the time the arc is on during the arc welding operation.
		b. the total time the welder is clocked into work.
		c. the non-arc fourth dimension.
		d. the total arc and non-arc fourth dimension.
This is also considered the operating factor and is thought of equally the percent of a shift that a welder/welding operator is really welding. For robotic and mechanized welding, information technology can be as loftier as 90% while for manual and semiautomatic welding it can be equally depression as 10-twenty% operating factors. Wrong answer. Please choose another answer.

14.	What is the difference betwixt back and bankroll welds?
		a. Equipment used
		b. Sequence of when the welds are made
		c. Materials used
		d. None of the above
Though the weld symbols are identical, the sequence of how the welds are fabricated is different.  The back weld is made last and the backing weld is made first. Incorrect answer. Please choose some other answer.

15.	What NDE process is indicated in the following description? Detects surface discontinuities only. Information technology can too verify fit-up, joint configuration, weld dimensions and profiles.
		a. PT
		b. RT
		c. MT
		d. VT
VT stands for Visual Examination. This is the most common NDE process and can be used before, during and later welding to clinch product quality and productivity. Wrong respond. Please choose some other reply.

16.	Penetrant Testing uses a penetrating liquid dye which is applied to a properly prepared surface. The dye is pulled into the discontinuity by _______ action.
		a. suction
		b. heating
		c. cooling
		d. capillary
Capillary action is the power of a liquid to menstruation in a narrow space or root opening. This is accomplished without the assist of external forces and even in opposition of external forces like gravity. Incorrect answer. Delight choose another answer.

17.	Which of the following is an established norm or requirement issued by the federal, state or local regime most technical systems?
		a. Welder Continuity Study
		b. Standards
		c. Specification
		d. Recommended Practices
A standard is established for utilise every bit a dominion or basis of comparison in measuring or judging capacity, quantity, content, extent, value, quality, etc… Incorrect answer. Please choose some other answer.

xviii.	Before welding can be done to an industrial welding standard, the supervisor needs to verify:
		a. the quality metric.
		b. the cost metric.
		c. the safety metric.
		d. that the welding procedure specifications and welder qualifications are in social club.
All industrial codes and standards reference the requirement for having qualified procedures. They demand to be openly bachelor and the welders need to be trained on their proper apply. The welders need to be qualified on those procedures and their qualification must be current. The supervisor needs to exercise this past verifying the welder's continuity written report. Incorrect answer. Please choose some other reply.

19.	Normal pant and shirt material worn around welding should be of what material?
		a. Polyester
		b. Rayon
		c. Cotton
		d. Synthetics
Cotton fiber and wool are mostly recommended apparel around welding operations. Synthetics similar polyester, rayon etc… are not recommended every bit they melt, creating more than of burn hazard. Incorrect respond. Delight cull another answer.

20.	What is the minimum oxygen level for a bars space?
		a. 14%
		b. 16%
		c. 19.5%
		d. 23.v%
Incorrect answer. Please cull some other answer.

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Source: https://www.tests.com/practice/welding-practice-test

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