Comprehensive analysis by scanning electron microscopy, electron probe inspection and metallographic analysis showed that the broken turbine bolt material contained a large amount of non-metallic inclusions. Its composition is oxides and silicates. These brittle inclusions have low deformation rate. During the process of steel deformation, the base metal which is relatively easy to deform plastically flows around the hard-to-deformed inclusions, causing a large tension. The connection between the metal and the inclusion interface breaks to form a void; or the inclusions break up due to the stress around the inclusion to form a void, which becomes a weak link in the material.
Generally, the inclusions have little effect on the longitudinal ductility of the steel, but the effect on the lateral ductility is significant. As the inclusions in the steel increase, the transverse section shrinkage of the steel decreases. At the same time, brittle inclusions with low deformation rates such as oxides, nitrides and silicates tend to act as a source of stress concentration, which lowers the impact value and increases the brittle transition temperature. Therefore, the elongation of the five samples measured in the tensile test meets the standard requirements, while the reduction of the area is far below the standard requirements; the impact toughness values ​​of the five impact samples are also far below the standard requirements.
The non-metallic inclusions present in the steam turbine bolt material also cause stress concentration when the bolt is stressed, that is, the stress rises sharply at the metal matrix adjacent to the end of the inclusion. Precautions Because the bolts are broken because the steel used to make the bolts contains a large amount of non-metallic inclusions, the following precautions are taken: the newly purchased bolts of the power plant should have a certificate of low-inspection inspection provided by the manufacturer. Forged bolts should be used when purchasing new bolts.
10W Mini Glue Gun Ptc Heating Features:
1. Versatile
2. Easy
3. Quick
4. Proective Nozzle Cover
5. Trigger Flow Control
6. Bonds instantly
7. High quality
8. High temperature or low temperature
Idea for many applications. Fastening various materials such as paper, cardboard, fabric,wood, lace,trims,leather,metal,glass, tiles, rubber, ceramics and flooring etc. Ideal for hobby and household repair,DIY&craft projects.
Designed and manufactured to the highest of standards to ensure a robust and long life, we hope it provides you with many years of trouble-free, safe and reliable service.
General Safety Information:
1. Check if the plug cord was in good condition, and if there is stand before plug into the electrical outlet ; Check if the used glue gun has glue flow through back of the tunnel;
2. wait 5-10 minutes to allow glue to soften, stand up the glue gun on the table when not in use;
3. Touch nozzle to any clean, dry surface you wish to bond, to avoid any impurity stop the nozzle;
4. If the glue could not flow from the nozzle when the glue gun start to work, check if the glue gun are heating;
If glue
gun can not be heated, there are following reasons:
1
Plug cord into electrical outlet not
properly;
2
Glue gun has been destroyed owing to
inner cord short circuit;
If glue gun can be heated, there are following reasons: Nozzle has been stopped by any impurity, ask careerman to manage it.
5. Do not use the glue gun under moist climate, humidity will affect insulation and cause electric shock;
6. Do not touch the nozzle or melted glue;
7. Do not remove out the melted glue stick from the tunnel back side, it will damaged the glue gun as well as scalding person hands.
8. Do not to disassemble or assemble any glue gun accessories freely, it will cause glue gun do not work properly;
9. Keep out of reach of children and stocked it beyond any of Children palpable side;
10. Only used for melting glue stick, no other usage;
11. When in use, there are any glue flow back from tunnel, stop using immediately, wait for careerman clean the glue;
12. Close the power if the glue gun not in use after 15 minutes;
Important Caution:
1． Before use the glue gun, check if the plug cord into electrical outlet properly;
2． When glue gun in first use, the heating element will have small smoke, it is normal situation, but the smoke will disappeared after 10 minutes;
3． After power, not for a long time in standby mode(not longer for 20 minutes), when the suspension of use, unplug first.
4． Avoid to use the glue gun under very hot or very cold environments.
5． Better not work under direct cold wind blowing, it will reduce efficiency and loss power
6． When in continuous using, do not press the trigger with great pressure, and try to squeeze out the un-melted glue, it would damage the glue gun
7． Not applicable for bonding heavy objects or objects needed strong adhesive
8． The quality of glue stick will directly influence the glue gun function and sticking objects quality;
9． If the power cord is damaged, do not replace it by yourself, must ask for professionals to replace it.
10． This tools must b e placed in its position when not in use. And storage before the tools complete cooled.
11． Be careful when using any other electrical appliance with flammable material.
12． Not applicable for a long time in the same place.
13． Do not use an explosive gas atmospheres.
14． Note that heat may be the line of sigh, combustible materials.
15． Do not leave equipment unattended when switched on.
16． This appliance is not intended for use by persons(including children) with reduced physical, sensory or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning use of the appliance by a person responsible for their safety.
17. Children should be supervised to ensure that they do not play with the appliance.
Using methods
1. Glue gun using voltage is 110-220V AC,50/60Hz;
2. Tip gun forward on stand and place a piece of cardboard under the nozzle
3. Use 7-8mm
(mini trigger glue gun), 11-12(big trigger glue gun), insert glue sticks
through
tunnel at back of gun
4. After power, wait for 5-10 minutes to allow glue to soften
After glue softens, squeeze trigger to feed glue through glue barrel. Excessive force will damage glue gun. Put down nozzle after work, disconnect the power plug
Mini Glue Gun
10W Mini Glue Gun, Mini Glue Gun, Small Glue Gun, Electric Glue Gun
Ningbo Kingvos Electrical Appliance Co.,Ltd , http://www.kingvos.com