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The pulse MIG welding technique with a tandem torch was used for depositing martensitic stainless steel 17-4 pH .
 manufacturing process: MIG welding; machine or equipment: tandem torch; material: martensitic stainless steel; concept or principle: pH
Given options, please tell me the categories of all the listed entity words.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} 
 Entities: MIG welding, tandem torch, martensitic stainless steel, pH 
Answer:
 manufacturing process: MIG welding; machine or equipment: tandem torch; material: martensitic stainless steel; concept or principle: pH