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OP Welding
| Question | Answer |
|---|---|
| Name three of the principle types of welding? | Gas welding, electric arc welding, electric resistance welding. |
| What are some advantages of gas shielded arc welding? | The weld is stronger, more ductile, more corrosion resistant. |
| Which method of welding is less likely to cause buckling or warping of thin metal sheets? | Electric arc (TIG) welding. |
| What is the purpose of shielding an arc weld with an inert gas? | The gas prevents atmospheric oxygen and/or nitrogen from contaminating the weld. |
| What is a common method of controlling expansion when welding a joint? | Place tack weld along the length of the joint. |
| What is the effect of inadequate penetration in the weld? | The weld will be weak. |
| What is the purpose of flux used with brazing and silver soldering? | The flux cleans the base metal by removing any oxide film. |
| What type of flame is used when torch brazing or silver soldering? | A neutral flame. |
| What must be done to a soldering iron tip to increase the amount of heat transferred from the tip to the work? | The tip must be cleaned of all contaminants and properly tinned. |
| What is the preferred method for welding aluminum? | Tungsten Inert Gas (TIG) welding. |
| What is the preferred method for welding magnesium? | Tungsten Inert Gas (TIG) welding. |
| What precaution must be observed in order to weld titanium? | All traces of oxygen and nitrogen must be kept away from the weld area by shielding with an inert gas such as helium or argon. |
| Describe one type of repair that could be made to a dented steel tube cluster joint? | A formed steel patch plate could be welded over the damaged area. |
| How can a soft flame be obtained without reducing the heat output of the torch? | Use a large tip and adjust the gas pressure appropriately. |
| What factors determine the amount of heat delivered by a gas welding torch? | The size of the tip and the amount of gas pressure. |
| When an oxyacetylene torch is extinguished which valve is turned of first? | Turn of the acetylene gas valve first. |
| When a gas welding project is completed what safety precautions should be accomplished? | All the valves turned off and the gas pressures relieved. |
| What should be done to a heat treated aluminum part after weld repairs are completed? | The part must be re heat treated. |
| Welding magnesium can create a serious safety hazard. What is the nature of this hazard? | Magnesium burns with a very hot flame that is very hard to extinguish. |
| What technique might be used to enable a tight fitting inner sleeve to be inserted into a tubu | |
| What type of weld joint must be used to weld magnesium? | A butt weld must be used to avoid possibility of trapping contaminants. |
| Why must all flux be removed from base material after welding magnesium? | Leaving flux on magnesium will cause severe corrosion. |
| What shielding gases are used gas tungsten arc (TIG) welding? | Helium or argon |
| What is meant by a soft flame? | A soft flame is when the torch is adjusted so noise is made and the flame does not push the weld puddle. |
| What is an advantage of electric arc welding over gas welding? | It causes less warping and buckling over the welded material. |
| What is the result of using a torch tip to large or to small? | To large will increase the heat applied and burn holes in the weld, to small will not be hot enough and cause a weak weld. |
| How do you determine the correct filler rod to be used in welding? | A rod to small will not conduct enough heat away from the puddle fast enough and a burned weld will occur, To large will cool the puddle to quickly and not enough penetration will occur |
| What is the function of flux when soldering? | Flux erodes the corrosion from the metal when heated allowing the solder to make a stronger bond. |
| Why must acid core solder never be used on electrical wire? | Because left over acid flux will cause corrosion. |
| What is brazing? | Joining two metals with another non ferrous metal with a lower melting point such as silver soldering, copper brazing and aluminum brazing? |
| Why is a soft flame desirable for welding aluminum? | So it doesn't blow holes in the metal when the weld is formed. |
| What fuel is used for welding aluminum? | Oxygen and hydrogen. |
| What is the purpose of using flux when welding aluminum? | To remove oxides. |
| What is the safe pressure for acetylene gas? | Max 15 psi. at 29.4 psi it is self explosive. |
| What type of flame should be used for silver soldering? | Neutral. |
| What are the procedures for preparing a metal fuel tank for welding? | Must be cleaned with water and detergent, steamed for 30 minutes, fill with c02 and vent through a small hole. |
| Why is flux used on silver solder? | Cleans the material of oxides and ensures a good bond. |
| Name some types of welding? | Electric arc, electric resistance, gas, plasma, brazing |
| What is the difference in the appearance of an oxidizing flame, a neutral flame, and a reducing flame produced by an oxy-acetylene torch? | An oxidizing flame has a pointed inner cone, and the torch makes a hissing noise. A neutral flame has a rounded inner cone, and there is no feather around the inner cone. A reducing flame has a definite feather around the inner cone. |
| Why must thick plates of metal be preheated before they are welded? | Preheating is a method of controlling the expansion and contraction of the metal that is being welded. Preheating minimizes the stresses that are caused when welding thick metal. |
| What is the difference between brazing and welding? | In brazing, the base metal is not melted, but is covered with a low-melting-point alloy. In welding, the base metal is melted. |
| Is a heat-treated steel part normally repairable by welding? | No, welding destroys the heat treatment. |
| What is an acceptable acetylene line pressure to use when welding with an oxyacetylene rig? | About 5 psi. |
| How much should the bead penetrate the material when welding two pieces of steel with a butt weld? | The joint should have 100 percent penetration. |
Created by:
g153511
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