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hardiflex
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What is a straight weld bead on the surface of a plate with little or no side to side electrode movement called?
A narrow, straight weld bead that is created by moving the SMAW electrode straight along the weld joint. A quality stringer bead should have good tie-in on both sides of the weld.
What is hot shortness in welding?
During weld pool solidification , impurities like sulfur get cooler at lower temp than surrounding weld hence due solidification of sulfur there is crack observed.
What effects does wind velocity has on the weld?
All types of welding rely on some form of protection to keep the weld puddle from oxidizing. Molten metal has an afinity to oxygen. Some processes use an inert gas ( ie:GTAW GMAW) the G, being Gas, is usually argon,helium, or CO2. SMAW (stick welding) S being Shielded, uses both slag and smoke to protect the molten puddle. Therefore it stands to reason if the wind is strong enough to blow away the smoke or inert gas then oxygen contained in the air can attack and destroy the weld.
What is the best adhesive to attach metal to metal?
The best I have found is JB Weld.
What you know about the effect of mechanical behaviour on the ferrous material by friction welding at the tension?
Friction Welding can produce welds that have tensile strengths as strong as the parent material. The design must account for the weld. Sharp edges must not be present near the weld joint.
What does porosity mean in welding?
Porosity is the formation of bubbles in the weld.
What is porosity in welding applicaton?
Porosity is nothing more than bubbles in the weld. Surprisingly a weld can contain quite a bit of porosity without affecting the strength.
What should the welder watch if the view of the weld is obstructed by the shielding gas nozzle?
Porosity
What are the welding defects in sheet metal?
Porosity is the most common weld defect. For beginners don't rule out lack of penetration and non-compatible welding rod or filler wire. It all depends on how the weld failed if it has. Proper prep and preheat is required in many types of welding. So a little more detailed question can help me give you a more detailed answer. Trapped slag is also a common problem. It creates a void in the weld. Although porosity is the most common defect some porosity doesn't necessarily affect the weld strength.
Where does silica come from when tig welding carbon steel?
Silicon is added to the tig rods in production. Use a gas weld rod which does not have the silicon and the weld will be full of porosity.
If electrode use in welding has moisture what effect will it have on the weld?
Electrodes with too much moisture may lead to cracking or porosity.
What is porosity on metal welding?
Weld porosity is gas formations that did not escape prior to the weld solidification. These gases can be formed from water (which breaks down to hydrogen and oxygen atoms), oil, paint, rust or many other contaminants. The welding contamination can be on your welding materials as well as on the base metal (damp welding electrodes, etc.).
How is porosity caused in welding?
Hi porosity is the gas pores (or) gas pocket travel deep in the solidified weld bead. Major causes $ Inadequate shielding gas $ Poor welding technique $ Damaged welding accessories $ Natural effects like wind flow
What does porosity in a weld means?
Porosity in welding is a result of dissolved gases or gases released during the welding process, being trapped in the metal when there is insufficient time to escape prior to solidification. If in the shape of rounded holes, the gas is called spherical porosity or just porosity. However, if elongated the terminology is wormholes or piping. Causes of porosity are;excessively long or short arc lengthwelding current too highinsufficient or moist shielding gastravel speed to fastbase metal covered with oil, grease, moisture etc.wet, unclean or damaged electrodes.
What is submerged arc welding?
Sub arc welding is a process in which the welding actually occurs while submerged under a layer of flux. Not only does this prevent oxygen from entering the weld and thus porosity, but it also keeps the dangerous arc from sputtering and spattering from the weld.
Is there porosity on stainless welding?
Porosity is caused by molten puddle problems: oil, dirt, etc near weld, lack of shielding gas (tank is empty, or wind is blowing away gas. local vaccums for ventilation also can cause gas problems.) If mig welding, if you don't balance wire speed to amps, you may see porosity. Lastly, long arc'ing (too much distance from end of mig wire, to material) can cause bubbling.
Can you use jb weld on a cracked exhaust manifold?
You can try, but it will not stay. The heating and cooling of the manifold will cause the JB weld to fall off.You can try, but it will not stay. The heating and cooling of the manifold will cause the JB weld to fall off.
