Question

Because of their complex shape, weld stresses that the setup during welding and cooling may be severe. To avoid weld cracking during these applications, select a low-hydrogen electrode with low ductility. What type of electrode should be selected to avoid weld cracking during these applications?

1) High-hydrogen electrode with high ductility
2) Low-hydrogen electrode with high ductility
3) High-hydrogen electrode with low ductility
4) Low-hydrogen electrode with low ductility

Answer 1

2) low-hydrogen electrode with high ductility, To avoid weld cracking, one should select a as it minimizes hydrogen embrittlement and accommodates stresses during welding and cooling.

Step-by-step explanation:

In order to avoid weld cracking, especially when dealing with complex shapes and thermal stresses, it is important to select the appropriate type of electrode.

The right choice would be a low-hydrogen electrode with high ductility. The low hydrogen content helps to minimize the risk of hydrogen embrittlement, which can lead to cracking. Additionally, high ductility allows the weld material to stretch more without breaking, accommodating stresses that occur during welding and cooling.

Therefore, among the options provided, the best electrode to prevent weld cracking in these applications would be option 2) Low-hydrogen electrode with high ductility.

In contrast, a high-hydrogen electrode with high ductility (Option 1) would increase the risk of weld cracking. The hydrogen content in the electrode can contribute to hydrogen-induced cracking, while high ductility allows for greater deformation and movement, making the weld susceptible to cracks.