Welding process of high-strength wear-resistant steel BISALLOY80
1. Pre-Processing
Prior to welding BISALLOY80, it is recommended that the steel should be pre-heated to a temperature between 150 - 200°C. This pre-heating encourages consistent welding conditions and toughens the steel by reducing its tendency to crack when processed. Furthermore, this pre-heating process helps to reduce distortion and produce a cleaner weld.
2. Choice of Welding Electrode
For welding BISALLOY80, an electrode with a low hydrogen content should be used. It is also important to ensure that the welding rod is properly cleaned and baked in order to reduce the risk of weld metal with an excessive hydrogen content.
It is recommended that an austenitic stainless steel or nickel-based alloy electrode is used. This type of electrode is designed to provide good performance under highly abrasive and wear-resistant conditions.
3. Choice of Welding Process
The type of welding process used to join BISALLOY80 should be chosen based on the job requirements and the type of material being welded. For manual metal arc welding (MMAW), a semi-automatic or fully automatic welding process is the best option. This ensures a higher weld deposition rate, better quality and a more uniform weld profile.
4. Welding Procedure
Generally, welding BISALLOY80 should be done in the down hand position, as this gives better control of the weld pool, improved weld accuracy and better access to the weld area. It is also essential to ensure that the plates to be joined have been properly prepared, as defective plate material may lead to poor weld quality.
During the welding process, special precautions should be taken to ensure that the correct welding current is used, as well as the correct weld travel speed. This helps to prevent the arc from burning through the material and reduces hardening or porosity in the weld.
5. Post-Weld Heat Treatment
Post-weld heat treatment is essential for BISALLOY80 in order to ensure that the weldment has the desired mechanical properties. The post-weld heat treatment ensures that the oxide layers in the weld area are removed, resulting in a tougher and more wear-resistant weldment.
The post-heat treatment involves heating the weldment up to a temperature between 600-700°C for a period of time. This helps restore the mechanical properties of the weldment, as well as reducing cracking and hardening.
In conclusion, high-strength wear-resistant steel BISALLOY80 can be successfully welded using the correct pre-processing and welding procedure. It is important that the correct welding electrode and process is used, as well as proper post-weld heat treatment. This will ensure a strong, wear-resistant weldment with the desired mechanical properties.
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