Field Service Welder / Machinist

Mesa, Arizona, USA – onsite position.

About the role

The Field Service Welder/Machinist performs welding, machining, fabrication, and mechanical repair services on Komatsu mining and construction equipment at customer job sites and company facilities. This role diagnoses structural and mechanical issues, executes precision repairs, and ensures equipment is returned to safe, reliable operating condition while minimizing customer downtime. Frequent travel to mine sites, construction projects, and remote customer locations is required.

Responsibilities

• Perform field and shop welding repairs on heavy mining and construction equipment.
• Conduct line boring, bore welding, shaft repair, and precision machining operations.
• Repair and rebuild buckets, blades, truck beds, frames, booms, and other structural components.
• Read and interpret blueprints, drawings, welding procedures, and repair specifications (geometric tolerance understanding preferred).
• Operate portable machining equipment, line boring machines, cutting torches, and welding equipment.
• Perform metal fabrication, fitting, grinding, and assembly work.
• Inspect equipment for cracks, wear, and structural damage.
• Follow OEM repair standards and quality control procedures.
• Complete service reports, repair documentation, and timesheets accurately.
• Maintain company tools, service vehicles, and equipment.
• Travel to customer locations, mines, quarries, and construction sites as required.
• Adhere to all safety, environmental, and company policies.

Requirements

• High school diploma or GED.
• Journeyman Welder, Machinist certification, or equivalent experience preferred.
• Experience welding carbon steel, stainless steel, and high-strength alloy materials.
• Proficiency in FCAW, SMAW, GMAW, and oxy-fuel cutting processes.
• Experience operating portable line boring and machining equipment.
• Ability to read and interpret technical drawings and specifications (geometric tolerance understanding preferred).
• Valid driver’s license, clean driving record within the last five years, and ability to travel extensively.
• Strong troubleshooting and problem-solving skills.
• Proficient use of precision measuring tools (inside micrometers, outside micrometers, calipers, etc.).
• Complete pre-employment weld test and pass D1.1 unlimited thickness plate test within 6 months of employment.

Preferred Qualifications

• Previous experience working on Komatsu, P&H, Caterpillar, Hitachi, Liebherr, or other heavy equipment (excavators, trucks, wheel loaders, dozers, etc.).
• Understanding of the Faro laser tracker and practical field use.
• Experience working on P&H Mining Shovels (2300, 2800, and 4100 models).
• MSHA certification or mining experience.
• NDT inspection knowledge (MT, PT, UT).
• Crane, rigging, and lifting experience.
• CDL and welding certifications (AWS or equivalent).

Physical Requirements

• Ability to lift up to 50 lbs. regularly.
• Work in extreme weather and challenging field environments.
• Climb ladders, crawl, kneel, and work at heights.
• Stand for extended periods and perform physically demanding tasks.

Skills

• Strong welding and machining skills.
• Knowledge of heavy equipment structural repair techniques.
• Ability to work independently with minimal supervision.
• Excellent communication and customer service skills.
• Commitment to safety, quality, and productivity.

Schedule

• Average work schedule ranges from 78 to 84 hours per week, depending on customer demands, equipment outages, and project requirements.
• Typically works 6 days per week with 1 scheduled day off.
• Required to work extended shifts, overtime, weekends, holidays, and varying schedules to meet operational and customer needs.
• Must be available for emergency call-outs and unscheduled repairs to minimize equipment downtime.
• Frequent travel to mine sites, construction projects, and remote customer locations may be required.