16 Jan,2024
Tip：Weldability of high carbon steel
1 Welding method
High carbon steel is mainly used for structures with high hardness and high wear resistance, so the main welding methods are electrode arc welding, brazing and submerged arc welding.
2 Welding Materials
High carbon steel welding generally does not require the joint and base material equal strength. In arc welding, low hydrogen electrode with strong sulfur removal ability, low diffused hydrogen content of deposited metal and good toughness is generally selected. When the equal strength of weld metal and base metal is required, the corresponding grade of low hydrogen electrode should be selected; When the strength of the weld metal and the base metal is not required, a low-hydrogen electrode with a strength level lower than that of the base metal should be selected, and a electrode with a strength level higher than that of the base metal should not be selected. If the base metal is not allowed to preheat during welding, in order to prevent cold cracks in the heat affected zone, austenitic stainless steel welding rods can be selected to obtain an austenitic structure with good plasticity and strong crack resistance.
3 Groove preparation
In order to limit the mass fraction of carbon in the weld metal, the fusion ratio should be reduced, so U-shaped or V-shaped groove is generally used in welding, and pay attention to clean the oil and rust in the 20mm range of the groove and both sides of the groove.
4 Preheating
When using structural steel welding rod, it must be preheated before welding, and the preheating temperature is controlled at 250℃ ~ 350℃.
5 Interlayer processing
In multi-layer and multi-pass welding, the first welding adopts small diameter electrode and small current welding. Generally, the workpiece is placed in semi-vertical welding or the transverse swing of the welding rod is used to heat the entire heat-affected zone of the base metal in a short time to obtain preheating and heat preservation effects.
6 Post-welding heat treatment
Immediately after welding, the workpiece is placed in the heating furnace and subjected to heat preservation at 650 ° C for stress relief annealing
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