Weldability of Metals and Alloys金属焊接性_智慧树知到答案2021年

第一章 Weldabitliy and Testing：This chapter is mainly about the introduction of weldabiltiy and how to evaluate the weldabitly of metals and alloys.1.1Weldabitliy:Weldabitliy A material's weldability refer to more qualitative characteristics of how easy or difficult it is to achieve a functional weld. It is depend on a variety of factors and not easily to be quantified. In evaluating weldability we employ the concept of fitness for purpose, including the difficulty in obtaining a sound welded joint, necessity of using pre-heating control of the thermal regime of welding, limitation of the specific heat input etc.
1.2Susceptability Testing:Cracking susceptibility testing is widely used to assess the fabricability of materials by various welding processes and to determine the service performance of welded construction. Only a few of these have been standardized. ISO 17641 and 17642 provide procedures for hot cracking and cold cracking tests, respectively. These standards include the Varestraint and PVR tests for solidification cracking and the controlled thermal severity (CTS) and Y-groove (Tekken) tests for HIC. A summary of the weldability tests that are covered by the ISO standards is provided in in this section.

[多选题]Weldability is not easily quantified, and can depend on a variety of factors, including  ( ).

选项:[welding method, welded structure, physical specifics of the joint, operator and welder]
[多选题]The calculation formula of carbon equivalent of the IWS considers the influence of () on weldability.

选项:[diffusion hydrogen, chemical composition, welding structure , welding process]
[单选题]Maximum crack distance has been used to allow more accurate determination of the cracking ( ) range.

选项:[toughness, strength, size, temperature]
[单选题]With carbon equivalent ( ), the steel has a low tendency to harden and cold cracking?

选项:[less than 0.60%, less than 0.40%, less than 0.80%, less than 0.50%]
[单选题]( ) is not a factor that affects weldability.

选项:[operation skill, chemical composition, Welding process, joint type]