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The aim of this study is to investigate the influence of pre-heat treatment on laser beam weldability of Selective Laser Welding ( SLM ) stainless steel to Cold Rolled ( CR ) stainless steel .
 manufacturing process: pre-heat treatment; concept or principle: laser beam; manufacturing process: Selective Laser; manufacturing process: SLM; material: stainless steel; manufacturing process: Cold Rolled; material: CR; material: stainless steel
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 manufacturing process: pre-heat treatment; concept or principle: laser beam; manufacturing process: Selective Laser; manufacturing process: SLM; material: stainless steel; manufacturing process: Cold Rolled; material: CR; material: stainless steel