Welding- Red Seal Prep

WELDING- RED SEAL PREP Define low carbon steel - Steel with a carbon range of .05-.3% carbon Define medium carbon steel - Steel with a carbon range of .3-.45% carbon What's the rule of thumb for tungsten end prep? - 2.5x E ø What can excessive spatter and undercut of weld bean be caused by? - High current When using a E4918 electrode and the arc is seen to be pulsing. What is the likely cause? - Wrong polarity What rod should not be stored in a rod oven? - Cellulosic MIG welding is almost always in what polarity? - DCEP When GMAW welding how is gas control regulated? - Flowmeter What does a CC mode require? - Voltage sensing wire feeder Which shielding medium is often used for carbon steel short circuit welding? - CO2 What is the maximum distance whip for a push type drive system? - 4.5M 15Feet Which shielding gas may require an in-line heater at high flow rates? - CO2 What do the letters GS mean in a ER70S-GS electrode? - Intended for single pass only What does the letter C stand for in a ER70C-X electrode? - Composite filler metal What is a normal Electrode extension for a FCAW-S? - 1 1/2 - 2 1/2 What type of drive roller is best suited for FCAW? - Knurled There are several types of SAW fluxes. Which one is reusable? - Fused flux Which wire feeder set-up is used with SAW aim CC mode? - Voltage sensing Brazing takes place by using a filler metal that becomes liquid at what temperature? - 450 degrees C In OFB of is the filler drawn into the joint? - Capillary action Which shielding gas is used to purge a copper pipe for brazing? - Nitrogen What drawing works off of 30° on both sides of the centreline? - Isometric What is the most serious welding defect? - Cracking How is the length of a file found? - Measuring from the tip to the heel What polarity is mostly used for ACAG? - DCEP Why is a smaller tip used rather than turning a torch down when cutting thin materials? - To prevent burn back into the torch If the bottom edge of the OFC is irregular and rough, what is the likely cause? - Travel speed to slow PAC uses what mode of process operation? - Transferred arc When must fall protection be employed? - Heights greater than 10' 3M What is the max noise for workers to be exposed