Welding Inspection & Metallurgy API ICP Self Study Notes

10.9.1 Metallurgy and Weldability
A primary factor affecting weldability of metals and alloys is their chemical
composition. Chemical composition not only controls the range of mechanical
properties in carbon steel and alloy steels, it has the most influence on the
effects of welding on the material. The heat cycles from welding in effect
produce a heat treatment on the metal that can have a substantial effect on
mechanical properties, depending on the chemical composition of the metal
being welded. As noted earlier, each type of metal has welding procedural
limits within which sound weldments with satisfactory properties can be
fabricated. If these limits are wide, the metal is said to have good weldability.
If the limits are narrow, the metal is considered to have poor weldability.
焊 接 程 序 上 的 限 制 宽 松 → 可 焊 性 好 .