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Job Description

Overview

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

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.
  • 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.
  • Valid driver's license with a clean driving record within the last five years.
  • Strong troubleshooting and problem-solving skills.
  • Ability to read and proficiently use precision measuring tools.
  • Complete pre-employment weld test and pass D1.1 unlimited thickness plate test within 6 months of employment.

Additional Information

  • Average work schedule ranges from 78 to 84 hours per week, typically working 6 days per week with 1 scheduled day off.
  • Frequent travel to mine sites, construction projects, and remote customer locations may be required.
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How this job compares in Mesa, AZ

Pay in context

This employer didn't publish a rate. For reference, welding jobs across Arizona currently run a median of $30/hr in our index, with the middle half of them falling between $24–$35/hr across 97 postings with published pay. That median is a reasonable floor to anchor on when a recruiter asks what you're looking for.

The local market in Mesa, AZ

We're tracking 23 other active welding openings in Mesa, AZ right now, from 21 different employers. 1 of them was added in the last week. Across Arizona as a whole we're tracking 285 other active welding openings from 175 employers. A metro this active generally means you have real leverage — employers here are competing for the same welders. Browse every welding job in Mesa, or widen the search to Arizona.

Komatsu currently has 1 other opening live in Arizona, which is usually a sign of either steady growth or steady turnover — worth asking which in the interview.

The most active employers in Arizona at the moment, by number of open welding reqs, are Welding Shop in Phoenix, AZ (9), Sundt Construction (8), and Comfort Systems USA Southwest (7). Volume like that usually means either a genuine expansion or a staffing agency working several client sites — worth knowing which before you apply.

Within Arizona, the best-paying metros we track by median hourly rate are Mesa at $38/hr, El Mirage at $38/hr, and Phoenix at $30/hr. Mesa is among them.

What you'll be running

This posting calls for MIG, Stick, and Flux-Core work. MIG (GMAW) feeds a continuous wire electrode through a shielding-gas nozzle. It lays down metal fast and is forgiving on clean material, which is why it dominates production and light fabrication work. Stick (SMAW) burns a flux-coated consumable rod and needs no shielding gas, so it works in wind, rain, and on dirty or rusted steel. That tolerance for bad conditions keeps it the default for field, structural, and repair work.

Certifications this posting mentions

  • AWS D1.1 — the American Welding Society's Structural Welding Code for steel. It governs almost all building and structural steel work in the US, so a D1.1 qualification is the baseline credential for construction and ironworking.

Read straight from this posting's text. Confirm the exact qualification the employer wants before you test — requirements vary by shop even under the same code.

Similar openings near Mesa, AZ

Pay figures are medians computed from live postings in the Welding Pros index, not from survey data, and they move as employers post. Field Service Welder / Machinist figures were last recalculated when this page was built.