Arc Surfacing Repair Process for 2010 Rolling Mill Rolls

Literature Overview

This 1999 study published in the journal "Welding" (焊接), authored by Gong Shuili, Zhang Jianxun, Yu Qin, and Yin Litao from Xi'an Jiaotong University, Northwest Institute of Nuclear Technology, and Jinan Gas Company respectively, addresses the weldability assessment and arc surfacing repair process for 2010 rolling mill rolls. The work appears in Volume 6 of that year (pages 25-27, ISSN 1001-1382) and falls under classification TG455 (surfacing welding). The research was driven by the practical need to extend the service life of expensive rolling mill roll components through cost-effective repair rather than full replacement.

Core Technical Content

The study systematically evaluates the weldability of 2010 rolling mill roll material, which is a low-carbon alloy steel typically used in rolling mill applications where moderate strength and good toughness are required. The authors identify that 2010 steel contains approximately 0.20% carbon with alloy additions of manganese and other elements, giving it a relatively favorable carbon equivalent for welding purposes. The weldability analysis considers factors such as the carbon equivalent (CE), hardenability of the base metal, and susceptibility to cold cracking in the heat-affected zone.

The key engineering challenge identified is maintaining the surface hardness and wear resistance of the repaired roll while ensuring adequate toughness in the weld metal and HAZ. Rolling mill rolls experience severe contact stresses, thermal cycling, and abrasive wear during operation, which means the surfacing layer must provide enhanced tribological properties without introducing brittle phases or residual stress concentrations that could lead to premature failure.

Surfacing Material Selection and Process Parameters

The authors selected a manual arc surfacing approach using SMAW (Shielded Metal Arc Welding) as the primary process, which offers excellent portability and flexibility for on-site repair operations. The selection of surfacing consumables was guided by the following criteria:

The study emphasizes the importance of controlling heat input to prevent excessive grain growth in the HAZ while ensuring complete fusion between successive surfacing layers. The multi-pass approach allows for dilution management, where the first pass has higher dilution from the base metal and subsequent passes achieve progressively purer surfacing composition.

Engineering Practice Insights

From a practical standpoint, this research is highly relevant to maintenance engineers working in steel production and heavy industry. Rolling mill rolls are critical production assets, and their repair through surfacing welding can reduce replacement costs by 60-80% compared to purchasing new rolls. The study's methodology provides a framework that can be adapted to similar repair applications:

1. Assess base metal weldability through chemical analysis and carbon equivalent calculation
2. Determine performance requirements for the surfacing layer (hardness, wear resistance, toughness)
3. Select appropriate consumable composition to achieve target properties after accounting for dilution
4. Optimize process parameters through trial welds and metallurgical evaluation
5. Validate repair quality through hardness profiling, metallographic examination, and mechanical testing

The successful repair outcome reported in the paper demonstrates that 2010 rolling mill rolls can be effectively restored to service through manual arc surfacing, provided that proper material selection and process control are maintained. This approach aligns with industry practices documented in standards such as AWS D10.9 for surfacing welding procedures.

Reflections and Implications

This study, though published in 1999, remains fundamentally relevant to modern maintenance welding practices. The principles of weldability assessment, dilution management, and multi-pass surfacing strategy are universal and continue to apply regardless of the specific equipment or consumables available. For engineers working in steel pipe manufacturing and heavy equipment repair, the systematic approach demonstrated here—moving from material analysis through process selection to validation testing—represents a sound engineering methodology that should be followed in any surfacing repair application. The work also highlights the importance of understanding the service conditions that the repaired component must withstand, as this directly informs material selection and process optimization decisions.