Five multiple-choice checkup of welders

140, a model WS-400 GTAW welding with (D), arc static specific curve.
A, II B, VI C, 8 D, numerous
141, above a welding machine, the higher the obligation wheel, indicating namely (A).
A. There are loads in the work cycle, the longer the time for electrode B. The longer
C. The longer the duty cycle D. Welder The longer the no-load
142, welding machine to accustom to the dynamic ecology of the welding arc is called (C).
A. Static Characteristics of arc B. External Characteristic
C. D. Arc dynamic characteristics of the power of the dynamic properties
143, electrode arc welding power supply which does not contain the retinue (D).
A. B. moving roll moving steel welding transformer welding transformer ;
C. arc welding rectifier D. Since the saturated magnetic amplifier power
145, SMAW welding current culling is based on: (B).
A. C. rod length diameter welding rod rank B. ; D. Welding load voltage
146, in other conditions remain unchanged, the welding current increase will cause: (A).
A. penetration mushrooms B. decreases C. penetration weld length decreased ; D. electrode thawing rate decreases
147, using electrode arc welding method as welding austenitic stainless steel weld color ought be presented (B).
A. red B. yellow C. black blue ; D. Black
148, uses stainless iron arc welding electrode which an can not discourage intergranular corrosion (D).
A. B. rigid control channel to take a short arc among the temperature of the cheap heat input C. D. increase the measure of welding current
149, pulse welding, the base worth of the current from the (C) achieve.
A, the formation of the molten metal bath B, preheat the base metal C, to maintain the arc burning and preheat the base metal
D, to retain the arc scalding

150,GHD Purple Gift Set, TIG extinction, the use of the current decay method is proposed to prevent the generation of (B).
A,GHD IV Styling Set, absence of penetration B, cavity crack C, concave D, splash

151, general, GTAW short arc no taken due apt exposure to (A).
A, tungsten caustic burning and cozy to tungsten in the weld failings reasoned at the folder
B, a high-frequency magnetic fields and radioactive substances
C, caused the short circumference current is too colossal welder burned
D, tungsten burning yet not easy to ascend to the folder of tungsten in the weld defect
152, in the TIG welding, such as deliberately touching the tungsten and the wire ambition have a big splash and smoke; period welder should be (D).
A, without dispose
B, the arc can not be disturbed, to continue welding
C, tungsten collide with the cable by the blend patches, to continue welding
D, quickly stop welding, and grinding the contaminated place, sharpened tungsten and proceed welding
153,GHD Straighteners, TIG welding, the arc col temperature up to the hub (C).
A, 3200K B,GHD Carry Case & Heat Mat, 6000K C,GHD Purple Butterfly 2011, 10000K D, 20000K or above

154, the following is not GTAW DC positive polarity of the avails of (C).
A, pond deep and alley, tall productivity, the contractile compel and deformation of the workpiece are small B, tungsten is not easy overheating C, can be welded aluminum, magnesium and other tough to weld metal D, arc reliability is good
155, following on the GTAW to mention wrong is (B).
A, and MAG arc welding power compared to the synopsis and deformation of the workpiece are small B, MIG arc welding with high productivity compared to C, you can weld aluminum, magnesium and other difficult to weld metal D, Pulsed Tungsten welding heat input of small

156, automatic welding equipment to complete all welding operations of the welding usage namely called (A),
A. Automatic Welding B. C. semi-automatic welding Mechanized welding D. Manual welding
157, automatic pulsed TIG welding, the tip current from (D) role.
A. preheat the base metal increases to maintain the arc B. preheat the base metal to maintain the arc D. C. The formation of the molten metal bath

158, automatic TIG welding wire used,GHD IV Salon Straighteners, the minimum diameter is generally (B).
A. 0.5 B. 0.8 C. 0.2 D. 1.0
159, while using the method automated TIG welding 3 ~ 6mm thick, small diameter steel pipe, the general should be chosen (B) groove.
A. X-shaped B. V-shaped ; C. I-shaped D. K-shaped