01. 이론
PART 01 용접일반

Chapter 01. 용접의 원리 ································································································ 46
01. 용접의 개요 ··································································································· 46
02. 용접의 장·단점 및 역사 ··············································································· 47

Chapter 02. 피복 아크 용접 ····························································································49
01. 피복 아크 용접의 원리 ·················································································· 49
02. 피복 아크 용접의 전압 분포 ········································································· 51
03. 극성 ················································································································· 52
04. 아크 쏠림 ········································································································ 53
05. 용접 입열 ········································································································ 54
06. 용융 금속의 3가지 이행 형식 ······································································· 55
07. 교류 아크 용접기 ··························································································· 56
08. 용접기의 사용율 및 역률과 효율 ·································································· 58
09. 직류 용접기 ···································································································· 59
10. 용접기의 특성 ································································································· 60
11. 피복아크용접기 ····························································································· 61
12. 용접 작업용 기구 및 보호구 ········································································· 62
13. 피복 아크 용접의 피복제 ··············································································· 63
14. 용접봉의 규격 ································································································· 64
15. 피복 아크 용접 작업 ······················································································ 67
16. 용접 결함 ········································································································ 69

Chapter 03. 전기 저항 용접 ····························································································72
01. 전기 저항 용접의 개요 ·················································································· 72
02. 전기 저항 용접의 종류 ·················································································· 73

Chapter 04. 가스용접 및 절단 ························································································78
01. 가스 용접의 개요 ··························································································· 78
02. 용접용 가스 ···································································································· 80
03. 아세틸렌 발생기 ····························································································· 83
04. 아세틸렌의 폭발성 ························································································ 85
05. 용해 아세틸렌 ································································································· 86
06. 산소 용기와 호스 ··························································································· 87
07. 산소 아세틸렌의 불꽃의 종류 ········································································ 89
08. 역류, 역화 및 인화 ························································································ 90
09. 용접용 재료 및 용제 ······················································································ 90
10. 토치 및 팁 ······································································································ 93
11. 부속장치 ·········································································································· 94
12. 보호구 및 공구 ······························································································· 95
13. 산소 - 아세틸렌 용접 작업 ············································································· 96
14. 절단 ················································································································· 97
15. 납땜법 ··········································································································· 105

Chapter 05. 특수용접 ····································································································109
01. 불활성 가스 아크 용접(GTAW, GMAW-MIG, MAG,CO2) ·························· 109
02. 서브머지드 아크 용접(잠호 용접) ································································ 114
03. 이산화탄소 아크 용접 ·················································································· 117
04. 논실드 아크 용접 ························································································· 121
05. 플라즈마 아크 용접 ······················································································ 122
06. 일랙트로 슬랙 용접 ······················································································ 124
07. 일랙트로 가스 용접(인클로오스 탄산가스 용접) ········································· 125
08. 전자 빔 용접 ································································································ 125
09. 테르밋 용접 ·································································································· 126
10. 원자 수소 용접 ····························································································· 127
11. 아크 점 용접법 ····························································································· 128
12. 초음파 용접 ·································································································· 128
13. 가스 압접 ······································································································ 129
14. 마찰 용접 ······································································································ 129
15. 단락 이행 용접(short arc welding) ··························································· 129
16. 플라스틱 용접 ······························································································· 130
17. 스터드 용접 ·································································································· 130
18. 레이저 빔 용접 ····························································································· 131
19. 고주파 용접 ·································································································· 131
20. 아크 이미지 용접 ························································································· 131
21. 로봇 용접 ······································································································ 131

Chapter 06. 각종 금속의 용접 ······················································································133
01. 고탄소강 ········································································································ 133
02. 주철 ··············································································································· 134
03. 스테인리스강 ································································································· 135
04. 구리 및 구리 합금 ······················································································· 136
05. 알루미늄 합금 ······························································································· 136

PART 02 용접시공 및 검사

Chapter 01. 용접시공 ····································································································140
01. 용접 준비 ······································································································ 140
02. 용접작업 ········································································································ 141
03. 용접 후 처리 ································································································ 144

Chapter 02. 용접설계 ····································································································148
01. 용접자가 갖추어야할 지식 ··········································································· 148
02. 용접이음의 종류 ··························································································· 148
03. 용접 흠 형상의 종류 ···················································································· 149
04. 용착부 모양에 따른 분류 ············································································· 149
05. 용접홈의 명칭 ······························································································· 150
06. 필렛 용접의 종류 ························································································· 150
07. 용접이음의 강도 ··························································································· 150
08. 용접이음 설계를 할 때 주의점 ···································································· 151

Chapter 03. 용접부의 시험 및 검사 ·············································································152
01. 용접부의 시험 및 검사 ················································································ 152

Chapter 04. 작업안전 ····································································································160
01. 안전 표식의 색채 ························································································· 160
02. 작업 환경 ······································································································ 160
03. 통행과 운반 ·································································································· 161
04. 화재 및 폭발 방지책 ···················································································· 161
05. 소화기 ··········································································································· 162
06. 전기 용접 작업의 장애 ················································································ 162

PART 03 용접의 재료

Chapter 01. 금속의 개요 ·······························································································166
01. 금속과 그 합금 ····························································································· 166
02. 재료의 성질 ·································································································· 167
03. 금속의 결정 ·································································································· 169
04. 합금의 조직 ·································································································· 172

Chapter 02. 철강재료 ····································································································174
01. 제철법 ··········································································································· 174
02. 탄소강 ··········································································································· 177
03. 특수강 ··········································································································· 182
04. 주철 ··············································································································· 187

Chapter 03. 열처리 ········································································································193
01. 일반 열처리 ·································································································· 193
02. 특수 열처리 ·································································································· 196

Chapter 04. 비철 금속과 그 합금 ················································································199
01. 구리와 그 합금 ····························································································· 199
02. 알루미늄과 그 합금 ······················································································ 203
03. 마그네슘과 그 합금 ······················································································ 205
04. 기타 비철 금속 ····························································································· 206

PART 04 기계제도

Chapter 01. 제도통칙 ····································································································210
01. 제도(Drawing)의 정의 ················································································ 210
02. 제도 용구 ······································································································ 212
03. 선과 문자 ······································································································ 212
04. 기본 도법 ······································································································ 214
05. 단면의 표시법 ······························································································· 217
06. 치수 표시법 ·································································································· 219
07. 치수 공차 ······································································································ 222
08. 표면 거칠기와 다듬질 기호 ········································································· 223
09. 재료 기호 ······································································································ 224
10. 체결용 기계 요소 ························································································· 225
11. 스케치도 작성법 ··························································································· 228

Chapter 02. KS도시기호 ································································································230
01. 용접 기호 및 도면의 해독 ··········································································· 230
02. 배관의 도시기호 ··························································································· 233
03. 판금·제관 및 철골 구조물 해독 ································································· 235
04. 용접 기호 ···································································································· 236
02. 문제

문 제 연도별 기출문제
2015년 1회I용접기능사 기출문제 ············································································ 242
2015년 1회I특수용접기능사 기출문제 ····································································· 256
2015년 2회I용접기능사 기출문제 ············································································ 268
2015년 2회I특수용접기능사 기출문제 ····································································· 282
2015년 4회I용접기능사 기출문제 ············································································ 296
2015년 4회I특수용접기능사 기출문제 ····································································· 309
2016년 1회I용접기능사 기출문제 ············································································ 321
2016년 1회I특수용접기능사 기출문제 ····································································· 333
2016년 2회I용접기능사 기출문제 ············································································ 345
2016년 2회I특수용접기능사 기출문제 ····································································· 357
2016년 4회I용접기능사 기출문제 ············································································ 370
2016년 4회I특수용접기능사 기출문제 ····································································· 383
2017년I용접기능사 기출문제 ···················································································· 396
2017년I특수용접기능사 기출문제 ············································································· 409
2018년I용접기능사 기출문제 ···················································································· 422
2018년I특수용접기능사 기출문제 ············································································· 435
2019년I용접기능사 기출문제 ···················································································· 448
2019년I특수용접기능사 기출문제 ············································································· 461
2020년I용접기능사 기출문제 ···················································································· 475
2020년I특수용접기능사 기출문제 ············································································· 487

03. 부록
01. 자주 나오는 계산문제 확실히 정리하기 ······························································ 502
02. 마지막 30분 정리하기 ························································································· 512
03. 실기시험 기본 전류값 ·························································································· 542