Welding and Joining of Advanced High Strength Steels (AHSS): The Automotive Industry discusses the ways advanced high strength steels (AHSS) are key to weight reduction in sectors such as automotive engineering. It includes a discussion on how welding can alter the microstructure in the heat affected zone, producing either excessive hardening or softening, and how these local changes create potential weaknesses that can lead to failure. This text reviews the range of welding and other joining technologies for AHSS and how they can be best used to maximize the potential of AHSS. Reviews the properties and manufacturing techniques of advanced high strength steels (AHSS) Examines welding processes, performance, and fatigue in AHSS Focuses on AHSS welding and joining within the automotive industry

The fusion welding methods have traditionally been, and are today, normally used in the manufacture of automotive structures. Recent augmented procedure of Advanced High Strength Steels (AHSS) in automotive designs posed a desire to evaluate the application of fusion welding processes relative to the joining of AHSS. New developments in advanced high strength steels (AHSS) have helped reduce weight, improve fuel efficiency, and increase the crashworthiness of vehicles through enhanced mechanical properties. This has accelerated the integration of AHSS into the automotive architecture and increased demands to understand the effects of RSW. As a result, there has been a recent focus on the weldability of these steels.Welding and Joining of Advanced High Strength Steels illustrates and reviews the range of welding and other joining technologies for Advanced High Strength Steel (AHSS) and how they can be best utilized to get the most of the potential of AHSS. It covers detailed methods and discussions on how welding can change the microstructure in the heat affected area, fabricating either extreme hardening or softening, and how these changes generate potential weaknesses that can lead to failure. To understand the effects of microstructure on the mechanical performance of welds, it is important to recognize microstructural differences at the various weld regions. These include the base metal (BM), heat affected zone (HAZ) and fusion zone (FZ). The FZ is created by heating above the melting point, while the surrounding HAZ material itself consists of several regions which experience thermal cycles with progressively decreasing peak temperature from the fusion boundary.This book will be of valued for students and practitioners requiring information on the welding and joining of advanced high strength steels. Researchers and engineers within the steel and automotive industries will find it informative.

This volume comprises select proceedings of the AHSS 2017 conference. AHSS is an instrumental event in creating a platform for exchanging recent thoughts and results among a selective group of researchers working in the area of steel science and engineering. Twenty two selected papers have been included in this volume. This book will serve as a reference to many practitioners and researchers working in the areas of steel strength, characterization, and applications.

Chapter II discusses in detail the impact testing method and the instrumentation used including the mechanical and electrical components to acquire the test data.

Recent studies of the developments in welding steels with yield strengths greater than 150 ksi have included low-alloy martensitic steels, medium-alloy martensitic steels, nickel maraging steels, and bainitic steels. Only weldments from medium-alloy martensitic steels and nickel maraging steels have mechanical properties approaching those of the base plate without a complete postweld heat treatment. The most serious problem with the other steel is low toughness in the weld fusion zone. Adequate weld metal toughness under conditions of elastic strain can be obtarined over the entire 150 to 225 ksi yield-strength range only if the tungsten-arc welding process is used. Processes with higher deposition rates can produce comparable weld deposits only in the lower portion of the range. Above a yield strength of 200 ksi, 18Ni maraging steel weldments have the best combination of strength and toughness. Below 200 ksi, the HP 9-4-25 medium-alloy martensitic steel and 12Ni maraging steel weldments have nearly equal properties.