terrible ironing work是什么意思？

Ironing means welding, it is about melting and joining metal together.

Therefore, it means someone did a terrible job in welding.
The chinese should be "焊接".

可怕的熨平衣服工作

iron work: 炼铁厂

terrible ironing work: 可怕的炼铁厂

这衣服熨得可真糟糕！

衣服熨得太差了！