Field Service Welder / Machinist

Komatsu America Corp.; Mesa (AZ); On-site; USD 60,000 - 80,000; Full time

Job summary

Komatsu America Corp. in Mesa, AZ, seeks a Field Service Welder/Machinist to perform welding, machining, fabrication, and mechanical repair on mining and construction equipment at customer sites and company facilities.

You will diagnose issues and ensure safe, reliable operation with minimal downtime. This role requires frequent travel to mine sites and remote locations, with a demanding schedule of 78–84 hours per week, typically six days per week with one day off.

Qualifications

• High school diploma or GED required.
• Journeyman Welder/Machinist certification or equivalent experience preferred.
• Experience welding carbon steel, stainless steel, and high-strength alloys.
• 2+ years maintaining mining equipment (shovels, drills, loaders).
• Proficiency in FCAW, SMAW, and GMAW; oxy-fuel cutting.

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 components.
• Read and interpret blueprints, welding procedures, and repair specs; 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 complete service reports and timesheets.

Skills

Welding

Machining

Read blueprints

Troubleshooting

Customer service

Education

High school diploma or GED

Journeyman Welder/Machinist certification

Tools

Portable line boring equipment

Precision measuring tools

Oxy-fuel cutting equipment

Job description

Job Location (Short): Mesa, Arizona, USA, 85210-6105

Requisition ID: 36413

Onsite or Remote: Onsite Position

Join Komatsu and Be Part of Something Big!

Job Overview

The Field Service Welder/Machinist is responsible for performing welding, machining, fabrication, and mechanical repair services on Komatsu mining and construction equipment at customer job sites and company facilities. This position requires the ability to diagnose structural and mechanical issues, perform precision repairs, and ensure equipment is returned to safe and reliable operating condition while minimizing customer downtime.

This position has frequent travel to mine sites, construction projects, and remote customer locations. The average work schedule ranges from 78 to 84 hours per week, and tyipcally works 6 days per week 1 scheduled day off.

Key Job 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. With some understanding of geometric tolerance 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.

Qualifications/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.
• 2+ years maintaining mining equipment such as shovels, drills, loaders, etc.
• 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. With some understanding of geometric tolerance preferred.
• Valid driver's license, clean driving record within the last five years and ability to travel extensively.
• Strong troubleshooting and problem-solving skills.
• Ability to read and proficiently use precision measuring tools, such as inside micrometers, outside micrometers, calipers, etc.
• Complete pre-employment weld test and pass D1.1 unlimited thickness plate test within 6mos of employment.

Additional Information

Preferred Qualifications

• Previous experience working on Komatsu, P&H, Caterpillar, Hitachi, Liebherr, or other heavy equipment such as excavators, trucks, wheel loaders, dozers, etc.
• Understanding of the Faro laser tracker and practical use in the field
• 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.

Knowledge, Skills, and Abilities

• 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.

Work Schedule

• Regularly works in field service environments supporting customer equipment repair and maintenance operations.
• 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.

Diversity & Inclusion Commitment

At Komatsu we come from diverse backgrounds, with unique perspectives, experiences, and contributions.We are committed to creating a workforce that is reflective of the communities we work and live in. We believe that our people are part of our shared purpose.We are authentic, ambitious, and innovative in our pursuit of Diversity & Inclusion.United, we are on a journey towards a sustainable future that creates value together.

Company Information

Komatsu is a world leader in manufacturing construction, mining, forestry, and industrial heavy equipment.Founded in 1921, Komatsu has a long history of quality, reliability, innovation, and excellence.Headquartered in Tokyo, Japan, Komatsu facilities, distributors and dealers are in more than 140 countries and employ more than 60,000 people.Komatsu offers a diverse and challenging work environment, where you can grow your skills and career, and contribute to a sustainable, clean-energy future.If you are looking for a company that values your talent and potential, be a part of something big and join a team that is shaping the world!