Avancerad sökning

Hittade 3 uppsatser som matchar ovanstående sökkriterier.

  1. 1. Resistance Spot Welding of AlSi-coated Ultra High Strength Steel : An experimental study

    Master-uppsats, KTH/Materialvetenskap

    Författare :Kristofer Hjelmtorp; [2019]
    Nyckelord :RSW; resistance spot welding; usibor; boron steel;

    Sammanfattning : The automotive industry of today faces ever harder requirements from regulatory bodies to increase the fuel efficiency, reduce the carbon footprint and increase the safety of their vehicles. The problem is being tackled in different ways; one of them being the use of innovative materials to reduce the overall weight while improving the crash safety of the vehicle. LÄS MER

  3. 2. High Performance Steel for Percussive Drilling

    Kandidat-uppsats, Uppsala universitet/Institutionen för teknikvetenskaper

    Författare :Mikael Fredriksson; Elin Åkerlund; Jakob Åberg; Patrik Österberg; Rebecka Havo; [2017]
    Nyckelord :Ultra high strength steel; ultra high strength; uhs; maraging; marageing; secondary hardened; low alloy; steel; alloy; fracture toughness; uts;

    Sammanfattning : Atlas Copco Secoroc AB are searching after new bulk materials for drill heads that are used in percussive drilling in order to improve their strength and durability. The aim of this project is to assist Atlas Copco in this search and provide them with further information regarding material properties, alloying elements, suppliers, etc. LÄS MER

  4. 3. Pilot Protection Based on Directional Detection

    Uppsats för yrkesexamina på avancerad nivå, KTH/Elektriska energisystem

    Författare :Sepehr Sefidpour; [2009]
    Nyckelord :Transmission line protection; UHS relaying; Traveling wave; Numerical relay.;

    Sammanfattning : Nowadays two main types of protection schemes widely used in protection of transmission lines are: distance protection and differential protection schemes. However, it has been noticed from industrial practice that the distance protection scheme used today generally is limited in tripping speed and selectivity. LÄS MER